Common use of SECURITYHOLDERS' LISTS AND REPORTS Clause in Contracts

SECURITYHOLDERS' LISTS AND REPORTS. BY THE COMPANY AND THE TRUSTEE 20 Section 5.01 Company to Furnish Trustee Names and Addresses of Securityholders 20 Section 5.02 Preservation Of Information; Communications With Securityholders 21 Section 5.03 Reports by the Company 21 Section 5.04 Reports by the Trustee 21 ARTICLE 6 REMEDIES OF THE TRUSTEE AND SECURITYHOLDERS ON EVENT OF DEFAULT 22 Section 6.01 Events of Default 22 Section 6.02 Collection of Indebtedness and Suits for Enforcement by Trustee 24 1 This Table of Contents does not constitute part of the Indenture and shall not have any bearing on the interpretation of any of its terms or provisions. Section 6.03 Application of Moneys Collected 25 Section 6.04 Limitation on Suits 25 Section 6.05 Rights and Remedies Cumulative; Delay or Omission Not Waiver 26 Section 6.06 Control by Securityholders 27 Section 6.07 Undertaking to Pay Costs 27 ARTICLE 7 CONCERNING THE TRUSTEE 28 Section 7.01 Certain Duties and Responsibilities of Trustee 28 Section 7.02 Certain Rights of Trustee 29 Section 7.03 Trustee Not Responsible for Recitals or Issuance or Securities 30 Section 7.04 May Hold Securities 31 Section 7.05 Moneys Held in Trust 31 Section 7.06 Compensation and Reimbursement 31 Section 7.07 Reliance on Officer’s Certificate or Opinion of Counsel 32 Section 7.08 Disqualification; Conflicting Interests 32 Section 7.09 Corporate Trustee Required; Eligibility 32 Section 7.10 Resignation and Removal; Appointment of Successor 33 Section 7.11 Acceptance of Appointment By Successor 34 Section 7.12 Merger, Conversion, Consolidation or Succession to Business 35 Section 7.13 Preferential Collection of Claims Against the Company 35 Section 7.14 Notice of Default 36 ARTICLE 8 CONCERNING THE SECURITYHOLDERS 36 Section 8.01 Evidence of Action by Securityholders 36 Section 8.02 Proof of Execution by Securityholders 36 Section 8.03 Who May be Deemed Owners 37 Section 8.04 Certain Securities Owned by Company Disregarded 37 Section 8.05 Actions Binding on Future Securityholders 37 ARTICLE 9 SUPPLEMENTAL INDENTURES 38 Section 9.01 Supplemental Indentures Without the Consent of Securityholders 38 Section 9.02 Supplemental Indentures With Consent of Securityholders 39 Section 9.03 Effect of Supplemental Indentures 39 Section 9.04 Securities Affected by Supplemental Indentures 40 Section 9.05 Execution of Supplemental Indentures 40 ARTICLE 10 SUCCESSOR ENTITY 40 Section 10.01 Company May Consolidate, Etc 40 Section 10.02 Successor Entity Substituted 41 ARTICLE 11 SATISFACTION AND DISCHARGE 42 Section 11.01 Satisfaction and Discharge of Indenture 42 Section 11.02 Discharge of Obligations 42 Section 11.03 Deposited Moneys to be Held in Trust 42 Section 11.04 Payment of Moneys Held by Paying Agents 43 Section 11.05 Repayment to Company 43 ARTICLE 12 IMMUNITY OF INCORPORATORS, STOCKHOLDERS, OFFICERS AND DIRECTORS 43 Section 12.01 No Recourse 43 ARTICLE 13 MISCELLANEOUS PROVISIONS 44 Section 13.01 Effect on Successors and Assigns 44 Section 13.02 Actions by Successor 44 Section 13.03 Surrender of Company Powers 44 Section 13.04 Notices 44 Section 13.05 Governing Law; Jury Trial Waiver 45 Section 13.06 Treatment of Securities as Debt 45 Section 13.07 Certificates and Opinions as to Conditions Precedent 45 Section 13.08 Payments on Business Days 45 Section 13.09 Conflict with Trust Indenture Act 46 Section 13.10 Counterparts 46 Section 13.11 Separability 46 Section 13.12 Compliance Certificates 46 Section 13.13 USA PATRIOT ACT 46 Section 13.14 Calculations 47 TRUST INDENTURE ACT CROSS-REFERENCE TABLE A-1 INDENTURE INDENTURE, dated as of [●], 201 , among UNUM THERAPEUTICS INC., a Delaware corporation (the “Company”), and [TRUSTEE] as trustee (the “Trustee”):

SECURITYHOLDERS' LISTS AND REPORTS. BY THE COMPANY AND THE TRUSTEE 20 14 Section 5.01 Company to Furnish Trustee Names and Addresses of Securityholders 20 14 Section 5.02 Preservation Of Information; Communications With Securityholders 21 14 Section 5.03 Reports by the Company 21 14 Section 5.04 Reports by the Trustee 21 14 ARTICLE 6 REMEDIES OF THE TRUSTEE AND SECURITYHOLDERS ON EVENT OF DEFAULT 22 15 Section 6.01 Events of Default 22 15 Section 6.02 Collection of Indebtedness and Suits for Enforcement by Trustee 24 1 This Table of Contents does not constitute part of the Indenture and shall not have any bearing on the interpretation of any of its terms or provisions. 16 Section 6.03 Application of Moneys Collected 25 17 Section 6.04 Limitation on Suits 25 17 Section 6.05 Rights and Remedies Cumulative; Delay or Omission Not Waiver 26 18 Section 6.06 Control by Securityholders 27 18 Section 6.07 Undertaking to Pay Costs 27 18 ARTICLE 7 CONCERNING THE TRUSTEE 28 19 Section 7.01 Certain Duties and Responsibilities of Trustee 28 19 Section 7.02 Certain Rights of Trustee 29 20 Section 7.03 Trustee Not Responsible for Recitals or Issuance or Securities 30 20 Section 7.04 May Hold Securities 31 21 Section 7.05 Moneys Held in Trust 31 21 Section 7.06 Compensation and Reimbursement 31 21 Section 7.07 Reliance on Officer’s Officers’ Certificate or Opinion of Counsel 32 21 Section 7.08 Disqualification; Conflicting Interests 32 21 Section 7.09 Corporate Trustee Required; Eligibility 32 22 Section 7.10 Resignation and Removal; Appointment of Successor 33 22 Section 7.11 Acceptance of Appointment By Successor 34 23 Section 7.12 Merger, Conversion, Consolidation or Succession to Business 35 24 Section 7.13 Preferential Collection of Claims Against the Company 35 24 Section 7.14 Notice of Default 36 24 ARTICLE 8 CONCERNING THE SECURITYHOLDERS 36 24 Section 8.01 Evidence of Action by Securityholders 36 24 Section 8.02 Proof of Execution by Securityholders 36 25 Section 8.03 Who May be Deemed Owners 37 25 Section 8.04 Certain Securities Owned by Company Disregarded 37 25 Section 8.05 Actions Binding on Future Securityholders 37 25 ARTICLE 9 SUPPLEMENTAL INDENTURES 38 26 Section 9.01 Supplemental Indentures Without the Consent of Securityholders 38 26 Section 9.02 Supplemental Indentures With Consent of Securityholders 39 26 Section 9.03 Effect of Supplemental Indentures 39 27 Section 9.04 Securities Affected by Supplemental Indentures 40 27 Section 9.05 Execution of Supplemental Indentures 40 27 ARTICLE 10 SUCCESSOR ENTITY 40 28 Section 10.01 Company May Consolidate, Etc 40 Etc. 28 Section 10.02 Successor Entity Substituted 41 28 Section 10.03 Evidence of Consolidation, Etc. to Trustee 28 ARTICLE 11 SATISFACTION AND DISCHARGE 42 29 Section 11.01 Satisfaction and Discharge of Indenture 42 29 Section 11.02 Discharge of Obligations 42 29 Section 11.03 Deposited Moneys to be Held in Trust 42 29 Section 11.04 Payment of Moneys Held by Paying Agents 43 29 Section 11.05 Repayment to Company 43 29 ARTICLE 12 IMMUNITY OF INCORPORATORS, STOCKHOLDERS, OFFICERS AND DIRECTORS 43 30 Section 12.01 No Recourse 43 30 ARTICLE 13 MISCELLANEOUS PROVISIONS 44 30 Section 13.01 Effect on Successors and Assigns 44 30 Section 13.02 Actions by Successor 44 30 Section 13.03 Surrender of Company Powers 44 30 Section 13.04 Notices 44 30 Section 13.05 Governing Law; Jury Trial Waiver 45 Law 31 Section 13.06 Treatment of Securities as Debt 45 31 Section 13.07 Certificates and Opinions as to Conditions Precedent 45 31 Section 13.08 Payments on Business Days 45 31 Section 13.09 Conflict with Trust Indenture Act 46 31 Section 13.10 Counterparts 46 31 Section 13.11 Separability 46 31 Section 13.12 Compliance Certificates 46 Section 13.13 USA PATRIOT ACT 46 Section 13.14 Calculations 47 TRUST INDENTURE ACT CROSS-REFERENCE TABLE A-1 INDENTURE INDENTURE, dated as of [●], 201 , among UNUM THERAPEUTICS INC., a Delaware corporation (the “Company”), and [TRUSTEE] as trustee (the “Trustee”):32

SECURITYHOLDERS' LISTS AND REPORTS. BY THE COMPANY AND THE TRUSTEE 20 Section 5.01 Company to Furnish Trustee Names and Addresses of Securityholders 20 Section 5.02 Preservation Of Information; Communications With Securityholders 21 Section 5.03 Reports by the Company 21 Section 5.04 Reports by the Trustee 21 22 ARTICLE 6 REMEDIES OF THE TRUSTEE AND SECURITYHOLDERS ON EVENT OF DEFAULT 22 Section 6.01 Events of Default 22 Section 6.02 Collection of Indebtedness and Suits for Enforcement by Trustee 24 1 This Table of Contents does not constitute part of the Indenture and shall not have any bearing on the interpretation of any of its terms or provisions. Section 6.03 Application of Moneys Collected 25 Section 6.04 Limitation on Suits 25 Section 6.05 Rights and Remedies Cumulative; Delay or Omission Not Waiver 26 Section 6.06 Control by Securityholders 27 Section 6.07 Undertaking to Pay Costs 27 ARTICLE 7 CONCERNING THE TRUSTEE 28 Section 7.01 Certain Duties and Responsibilities of Trustee 28 Section 7.02 Certain Rights of Trustee 29 Section 7.03 Trustee Not Responsible for Recitals or Issuance or Securities 30 Section 7.04 May Hold Securities 31 Section 7.05 Moneys Held in Trust 31 Section 7.06 Compensation and Reimbursement 31 Section 7.07 Reliance on Officer’s Certificate or Opinion of Counsel 32 Section 7.08 Disqualification; Conflicting Interests 32 Section 7.09 Corporate Trustee Required; Eligibility 32 Section 7.10 Resignation and Removal; Appointment of Successor 33 Section 7.11 Acceptance of Appointment By Successor 34 Section 7.12 Merger, Conversion, Consolidation or Succession to Business 35 Section 7.13 Preferential Collection of Claims Against the Company 35 Section 7.14 Notice of Default 36 ARTICLE 8 CONCERNING THE SECURITYHOLDERS 36 Section 8.01 Evidence of Action by Securityholders 36 Section 8.02 Proof of Execution by Securityholders 36 Section 8.03 Who May be Deemed Owners 37 Section 8.04 Certain Securities Owned by Company Disregarded 37 Section 8.05 Actions Binding on Future Securityholders 37 ARTICLE 9 SUPPLEMENTAL INDENTURES 38 Section 9.01 Supplemental Indentures Without the Consent of Securityholders 38 Section 9.02 Supplemental Indentures With Consent of Securityholders 39 Section 9.03 Effect of Supplemental Indentures 39 Section 9.04 Securities Affected by Supplemental Indentures 40 Section 9.05 Execution of Supplemental Indentures 40 ARTICLE 10 SUCCESSOR ENTITY 40 Section 10.01 Company May Consolidate, Etc 40 Section 10.02 Successor Entity Substituted 41 ARTICLE 11 SATISFACTION AND DISCHARGE 42 Section 11.01 Satisfaction and Discharge of Indenture 42 Section 11.02 Discharge of Obligations 42 Section 11.03 Deposited Moneys to be Held in Trust 42 Section 11.04 Payment of Moneys Held by Paying Agents 43 Section 11.05 Repayment to Company 43 ARTICLE 12 IMMUNITY OF INCORPORATORS, STOCKHOLDERS, OFFICERS AND DIRECTORS 43 Section 12.01 No Recourse 43 ARTICLE 13 MISCELLANEOUS PROVISIONS 44 Section 13.01 Effect on Successors and Assigns 44 Section 13.02 Actions by Successor 44 Section 13.03 Surrender of Company Powers 44 Section 13.04 Notices 44 Section 13.05 Governing Law; Jury Trial Waiver 45 Section 13.06 Treatment of Securities as Debt 45 Section 13.07 Certificates and Opinions as to Conditions Precedent 45 Section 13.08 Payments on Business Days 45 Section 13.09 Conflict with Trust Indenture Act 46 Section 13.10 Counterparts 46 Section 13.11 Separability 46 Section 13.12 Compliance Certificates 46 Section 13.13 USA PATRIOT ACT 46 Section 13.14 Calculations 47 TRUST INDENTURE ACT CROSS-REFERENCE TABLE A-1 INDENTURE INDENTURE, dated as of [●•], 201 20[•], among UNUM THERAPEUTICS PLIANT THERAPEUTICS, INC., a Delaware corporation (the “Company”), and [TRUSTEE] as trustee (the “Trustee”):

SECURITYHOLDERS' LISTS AND REPORTS. BY THE COMPANY AND THE TRUSTEE 20 12 Section 5.01 Company to Furnish Trustee Names and Addresses of Securityholders 20 12 Section 5.02 Preservation Of Information; Communications With Securityholders 21 13 Section 5.03 Reports by the Company 21 13 Section 5.04 Reports by the Trustee 21 13 ARTICLE 6 REMEDIES OF THE TRUSTEE AND SECURITYHOLDERS ON EVENT OF DEFAULT 22 13 Section 6.01 Events of Default 22 13 Section 6.02 Collection of Indebtedness and Suits for Enforcement by Trustee 24 1 This Table of Contents does not constitute part of the Indenture and shall not have any bearing on the interpretation of any of its terms or provisions. 14 Section 6.03 Application of Moneys Collected 25 15 Section 6.04 Limitation on Suits 25 16 Section 6.05 Rights and Remedies Cumulative; Delay or Omission Not Waiver 26 16 Section 6.06 Control by Securityholders 27 16 Section 6.07 Undertaking to Pay Costs 27 17 Table of Contents (continued) Page ARTICLE 7 CONCERNING THE TRUSTEE 28 17 Section 7.01 Certain Duties and Responsibilities of Trustee 28 17 Section 7.02 Certain Rights of Trustee 29 18 Section 7.03 Trustee Not Responsible for Recitals or Issuance or Securities 30 19 Section 7.04 May Hold Securities 31 19 Section 7.05 Moneys Held in Trust 31 19 Section 7.06 Compensation and Reimbursement 31 19 Section 7.07 Reliance on Officer’s Certificate or Opinion of Counsel 32 19 Section 7.08 Disqualification; Conflicting Interests 32 20 Section 7.09 Corporate Trustee Required; Eligibility 32 20 Section 7.10 Resignation and Removal; Appointment of Successor 33 20 Section 7.11 Acceptance of Appointment By Successor 34 21 Section 7.12 Merger, Conversion, Consolidation or Succession to Business 35 21 Section 7.13 Preferential Collection of Claims Against the Company 35 22 Section 7.14 Notice of Default 36 22 ARTICLE 8 CONCERNING THE SECURITYHOLDERS 36 22 Section 8.01 Evidence of Action by Securityholders 36 22 Section 8.02 Proof of Execution by Securityholders 36 22 Section 8.03 Who May be Deemed Owners 37 23 Section 8.04 Certain Securities Owned by Company Disregarded 37 23 Section 8.05 Actions Binding on Future Securityholders 37 23 ARTICLE 9 SUPPLEMENTAL INDENTURES 38 23 Section 9.01 Supplemental Indentures Without the Consent of Securityholders 38 23 Section 9.02 Supplemental Indentures With Consent of Securityholders 39 24 Section 9.03 Effect of Supplemental Indentures 39 24 Section 9.04 Securities Affected by Supplemental Indentures 40 24 Section 9.05 Execution of Supplemental Indentures 40 24 Table of Contents (continued) Page ARTICLE 10 SUCCESSOR ENTITY 40 25 Section 10.01 Company May Consolidate, Etc 40 Etc. 25 Section 10.02 Successor Entity Substituted 41 25 ARTICLE 11 SATISFACTION AND DISCHARGE 42 26 Section 11.01 Satisfaction and Discharge of Indenture 42 26 Section 11.02 Discharge of Obligations 42 26 Section 11.03 Deposited Moneys to be Held in Trust 42 26 Section 11.04 Payment of Moneys Held by Paying Agents 43 26 Section 11.05 Repayment to Company 43 26 ARTICLE 12 IMMUNITY OF INCORPORATORS, STOCKHOLDERS, OFFICERS AND DIRECTORS 43 27 Section 12.01 No Recourse 43 27 ARTICLE 13 MISCELLANEOUS PROVISIONS 44 27 Section 13.01 Effect on Successors and Assigns 44 27 Section 13.02 Actions by Successor 44 27 Section 13.03 Surrender of Company Powers 44 27 Section 13.04 Notices 44 27 Section 13.05 Governing Law; Jury Trial Waiver 45 Law 27 Section 13.06 Treatment of Securities as Debt 45 28 Section 13.07 Certificates and Opinions as to Conditions Precedent 45 28 Section 13.08 Payments on Business Days 45 28 Section 13.09 Conflict with Trust Indenture Act 46 28 Section 13.10 Counterparts 46 28 Section 13.11 Separability 46 28 Section 13.12 Compliance Certificates 46 Section 13.13 USA PATRIOT ACT 46 Section 13.14 Calculations 47 TRUST INDENTURE ACT CROSS-REFERENCE TABLE A-1 INDENTURE INDENTURE, dated as of [●], 201 , among UNUM THERAPEUTICS INC., a Delaware corporation (the “Company”), and [TRUSTEE] as trustee (the “Trustee”):28

SECURITYHOLDERS' LISTS AND REPORTS. BY THE COMPANY AND THE TRUSTEE 20 11 Section 5.01 Company to Furnish Trustee Names and Addresses of Securityholders 20 11 Section 5.02 Preservation Of Information; Communications With Securityholders 21 11 Section 5.03 Reports by the Company 21 12 Section 5.04 Reports by the Trustee 21 12 ARTICLE 6 REMEDIES OF THE TRUSTEE AND SECURITYHOLDERS ON EVENT OF DEFAULT 22 12 Section 6.01 Events of Default 22 12 Section 6.02 Collection of Indebtedness and Suits for Enforcement by Trustee 24 1 This Table of Contents does not constitute part of the Indenture and shall not have any bearing on the interpretation of any of its terms or provisions. 13 Section 6.03 Application of Moneys Collected 25 14 Section 6.04 Limitation on Suits 25 14 Section 6.05 Rights and Remedies Cumulative; Delay or Omission Not Waiver 26 14 Section 6.06 Control by Securityholders 27 15 Section 6.07 Undertaking to Pay Costs 27 15 ARTICLE 7 CONCERNING THE TRUSTEE 28 15 Section 7.01 Certain Duties and Responsibilities of Trustee 28 15 Section 7.02 Certain Rights of Trustee 29 16 Section 7.03 Trustee Not Responsible for Recitals or Issuance or Securities 30 17 Section 7.04 May Hold Securities 31 17 Section 7.05 Moneys Held in Trust 31 17 Section 7.06 Compensation and Reimbursement 31 17 Section 7.07 Reliance on Officer’s Certificate or Opinion of Counsel 32 17 Section 7.08 Disqualification; Conflicting Interests 32 17 Section 7.09 Corporate Trustee Required; Eligibility 32 18 Section 7.10 Resignation and Removal; Appointment of Successor 33 18 Section 7.11 Acceptance of Appointment By Successor 34 18 Section 7.12 Merger, Conversion, Consolidation or Succession to Business 35 19 Section 7.13 Preferential Collection of Claims Against the Company 35 19 Section 7.14 Notice of Default 36 ARTICLE 8 CONCERNING THE SECURITYHOLDERS 36 Section 8.01 Evidence of Action by Securityholders 36 Section 8.02 Proof of Execution by Securityholders 36 Section 8.03 Who May be Deemed Owners 37 Section 8.04 Certain Securities Owned by Company Disregarded 37 Section 8.05 Actions Binding on Future Securityholders 37 ARTICLE 9 SUPPLEMENTAL INDENTURES 38 Section 9.01 Supplemental Indentures Without the Consent of Securityholders 38 Section 9.02 Supplemental Indentures With Consent of Securityholders 39 Section 9.03 Effect of Supplemental Indentures 39 Section 9.04 Securities Affected by Supplemental Indentures 40 Section 9.05 Execution of Supplemental Indentures 40 ARTICLE 10 SUCCESSOR ENTITY 40 Section 10.01 Company May Consolidate, Etc 40 Section 10.02 Successor Entity Substituted 41 ARTICLE 11 SATISFACTION AND DISCHARGE 42 Section 11.01 Satisfaction and Discharge of Indenture 42 Section 11.02 Discharge of Obligations 42 Section 11.03 Deposited Moneys to be Held in Trust 42 Section 11.04 Payment of Moneys Held by Paying Agents 43 Section 11.05 Repayment to Company 43 ARTICLE 12 IMMUNITY OF INCORPORATORS, STOCKHOLDERS, OFFICERS AND DIRECTORS 43 Section 12.01 No Recourse 43 ARTICLE 13 MISCELLANEOUS PROVISIONS 44 Section 13.01 Effect on Successors and Assigns 44 Section 13.02 Actions by Successor 44 Section 13.03 Surrender of Company Powers 44 Section 13.04 Notices 44 Section 13.05 Governing Law; Jury Trial Waiver 45 Section 13.06 Treatment of Securities as Debt 45 Section 13.07 Certificates and Opinions as to Conditions Precedent 45 Section 13.08 Payments on Business Days 45 Section 13.09 Conflict with Trust Indenture Act 46 Section 13.10 Counterparts 46 Section 13.11 Separability 46 Section 13.12 Compliance Certificates 46 Section 13.13 USA PATRIOT ACT 46 Section 13.14 Calculations 47 TRUST INDENTURE ACT CROSS-REFERENCE TABLE A-1 INDENTURE INDENTURE, dated as of [●], 201 , among UNUM THERAPEUTICS INC., a Delaware corporation (the “Company”), and [TRUSTEE] as trustee (the “Trustee”):19

SECURITYHOLDERS' LISTS AND REPORTS. BY THE COMPANY AND THE TRUSTEE 20 Section 5.01 Company to Furnish Trustee Names and Addresses of Securityholders 20 Section 5.02 Preservation Of Information; Communications With Securityholders 21 20 Section 5.03 Reports by the Company 21 Section 5.04 Reports by the Trustee 21 ARTICLE 6 REMEDIES OF THE TRUSTEE AND SECURITYHOLDERS ON EVENT OF DEFAULT 22 Section 6.01 Events of Default 22 Section 6.02 Collection of Indebtedness and Suits for Enforcement by Trustee 24 1 This Table of Contents does not constitute part of the Indenture and shall not have any bearing on the interpretation of any of its terms or provisions. Section 6.03 Application of Moneys Collected 25 Section 6.04 Limitation on Suits 25 Section 6.05 Rights and Remedies Cumulative; Delay or Omission Not Waiver 26 Section 6.06 Control by Securityholders 27 26 Section 6.07 Undertaking to Pay Costs 27 ARTICLE 7 CONCERNING THE TRUSTEE 28 27 Section 7.01 Certain Duties and Responsibilities of Trustee 28 27 Section 7.02 Certain Rights of Trustee 29 Section 7.03 Trustee Not Responsible for Recitals or Issuance or Securities 30 Section 7.04 May Hold Securities 31 Section 7.05 Moneys Held in Trust 31 Section 7.06 Compensation and Reimbursement 31 Section 7.07 Reliance on Officer’s Certificate or Opinion of Counsel 32 Section 7.08 Disqualification; Conflicting Interests 32 Section 7.09 Corporate Trustee Required; Eligibility 32 Section 7.10 Resignation and Removal; Appointment of Successor 33 Section 7.11 Acceptance of Appointment By Successor 34 Section 7.12 Merger, Conversion, Consolidation or Succession to Business 35 Section 7.13 Preferential Collection of Claims Against the Company 35 Section 7.14 Notice of Default 36 35 ARTICLE 8 CONCERNING THE SECURITYHOLDERS 36 Section 8.01 Evidence of Action by Securityholders 36 Section 8.02 Proof of Execution by Securityholders 36 Section 8.03 Who May be Deemed Owners 37 Section 8.04 Certain Securities Owned by Company Disregarded 37 Section 8.05 Actions Binding on Future Securityholders 37 ARTICLE 9 SUPPLEMENTAL INDENTURES 38 Section 9.01 Supplemental Indentures Without the Consent of Securityholders 38 Section 9.02 Supplemental Indentures With Consent of Securityholders 39 Section 9.03 Effect of Supplemental Indentures 39 Section 9.04 Securities Affected by Supplemental Indentures 40 39 Section 9.05 Execution of Supplemental Indentures 40 ARTICLE 10 SUCCESSOR ENTITY 40 Section 10.01 Company May Consolidate, Etc 40 Section 10.02 Successor Entity Substituted 41 ARTICLE 11 SATISFACTION AND DISCHARGE 42 41 Section 11.01 Satisfaction and Discharge of Indenture 42 41 Section 11.02 Discharge of Obligations 42 Section 11.03 Deposited Moneys to be Held in Trust 42 Section 11.04 Payment of Moneys Held by Paying Agents 43 Section 11.05 Repayment to Company 43 ARTICLE 12 IMMUNITY OF INCORPORATORS, STOCKHOLDERS, OFFICERS AND DIRECTORS 43 Section 12.01 No Recourse 43 ARTICLE 13 MISCELLANEOUS PROVISIONS 44 Section 13.01 Effect on Successors and Assigns 44 Section 13.02 Actions by Successor 44 Section 13.03 Surrender of Company Powers 44 Section 13.04 Notices 44 Section 13.05 Governing Law; Jury Trial Waiver 45 44 Section 13.06 Treatment of Securities as Debt 45 Section 13.07 Certificates and Opinions as to Conditions Precedent 45 Section 13.08 Payments on Business Days 45 Section 13.09 Conflict with Trust Indenture Act 46 Section 13.10 Counterparts 46 Section 13.11 Separability 46 Section 13.12 Compliance Certificates 46 Section 13.13 USA PATRIOT ACT 46 Section 13.14 Calculations 47 46 TRUST INDENTURE ACT CROSS-REFERENCE TABLE A-1 INDENTURE INDENTURE, dated as of [●[ ], 201 201[ ], among UNUM THERAPEUTICS ALTAIR ENGINEERING INC., a Delaware corporation (the “Company”), and [TRUSTEE] U.S. BANK NATIONAL ASSOCIATION, a national banking association as trustee (the “Trustee”):

SECURITYHOLDERS' LISTS AND REPORTS. BY THE COMPANY AND THE TRUSTEE 20 13 Section 5.01 Company to Furnish Trustee Names and Addresses of Securityholders 20 13 Section 5.02 Preservation Of Information; Communications With Securityholders 21 13 Section 5.03 Reports by the Company 21 13 Section 5.04 Reports by the Trustee 21 13 ARTICLE 6 REMEDIES OF THE TRUSTEE AND SECURITYHOLDERS ON EVENT OF DEFAULT 22 14 Section 6.01 Events of Default 22 14 Section 6.02 Collection of Indebtedness and Suits for Enforcement by Trustee 24 1 This Table of Contents does not constitute part of the Indenture and shall not have any bearing on the interpretation of any of its terms or provisions. 15 Section 6.03 Application of Moneys Collected 25 16 Section 6.04 Limitation on Suits 25 16 Section 6.05 Rights and Remedies Cumulative; Delay or Omission Not Waiver 26 16 Section 6.06 Control by Securityholders 27 17 Section 6.07 Undertaking to Pay Costs 27 17 ARTICLE 7 CONCERNING THE TRUSTEE 28 17 Section 7.01 Certain Duties and Responsibilities of Trustee 28 17 Section 7.02 Certain Rights of Trustee 29 18 Section 7.03 Trustee Not Responsible for Recitals or Issuance or Securities 30 19 Section 7.04 May Hold Securities 31 19 Section 7.05 Moneys Held in Trust 31 19 Section 7.06 Compensation and Reimbursement 31 19 Section 7.07 Reliance on Officer’s Certificate or Opinion of Counsel 32 20 Section 7.08 Disqualification; Conflicting Interests 32 20 Section 7.09 Corporate Trustee Required; Eligibility 32 20 Section 7.10 Resignation and Removal; Appointment of Successor 33 20 Section 7.11 Acceptance of Appointment By Successor 34 21 Section 7.12 Merger, Conversion, Consolidation or Succession to Business 35 22 Section 7.13 Preferential Collection of Claims Against the Company 35 22 Section 7.14 Notice of Default 36 22 TABLE OF CONTENTS (continued) Page ARTICLE 8 CONCERNING THE SECURITYHOLDERS 36 22 Section 8.01 Evidence of Action by Securityholders 36 22 Section 8.02 Proof of Execution by Securityholders 36 23 Section 8.03 Who May be Deemed Owners 37 23 Section 8.04 Certain Securities Owned by Company Disregarded 37 23 Section 8.05 Actions Binding on Future Securityholders 37 23 ARTICLE 9 SUPPLEMENTAL INDENTURES 38 24 Section 9.01 Supplemental Indentures Without the Consent of Securityholders 38 24 Section 9.02 Supplemental Indentures With Consent of Securityholders 39 24 Section 9.03 Effect of Supplemental Indentures 39 25 Section 9.04 Securities Affected by Supplemental Indentures 40 25 Section 9.05 Execution of Supplemental Indentures 40 25 ARTICLE 10 SUCCESSOR ENTITY 40 25 Section 10.01 Company May Consolidate, Etc 40 25 Section 10.02 Successor Entity Substituted 41 26 Section 10.03 Evidence of Consolidation, Etc 26 ARTICLE 11 SATISFACTION AND DISCHARGE 42 26 Section 11.01 Satisfaction and Discharge of Indenture 42 26 Section 11.02 Discharge of Obligations 42 27 Section 11.03 Deposited Moneys to be Held in Trust 42 27 Section 11.04 Payment of Moneys Held by Paying Agents 43 27 Section 11.05 Repayment to Company 43 27 ARTICLE 12 IMMUNITY OF INCORPORATORS, STOCKHOLDERS, OFFICERS AND DIRECTORS 43 27 Section 12.01 No Recourse 43 27 ARTICLE 13 MISCELLANEOUS PROVISIONS 44 28 Section 13.01 Effect on Successors and Assigns 44 28 Section 13.02 Actions by Successor 44 28 Section 13.03 Surrender of Company Powers 44 28 Section 13.04 Notices 44 28 Section 13.05 Governing Law; Jury Trial Waiver 45 Law 28 Section 13.06 Treatment of Securities as Debt 45 28 Section 13.07 Certificates and Opinions as to Conditions Precedent 45 28 Section 13.08 Payments on Business Days 45 29 Section 13.09 Conflict with Trust Indenture Act 46 29 Section 13.10 Counterparts 46 29 Section 13.11 Separability 46 29 Section 13.12 Compliance Certificates 46 29 ARTICLE 14 SUBORDINATION OF SECURITIES 29 Section 13.13 USA PATRIOT ACT 46 Section 13.14 Calculations 47 TRUST INDENTURE ACT CROSS-REFERENCE TABLE A-1 INDENTURE INDENTURE, dated as of [●], 201 , among UNUM THERAPEUTICS INC., a Delaware corporation (the “Company”), and [TRUSTEE] as trustee (the “Trustee”):14.01 Subordination Terms 29

SECURITYHOLDERS' LISTS AND REPORTS. BY THE COMPANY AND THE TRUSTEE 20 Section 5.01 Company to Furnish Trustee Names and Addresses of Securityholders 20 Section 5.02 Preservation Of Information; Communications With Securityholders 21 Section 5.03 Reports by the Company 21 Section 5.04 Reports by the Trustee 21 ARTICLE 6 REMEDIES OF THE TRUSTEE AND SECURITYHOLDERS ON EVENT OF DEFAULT 22 Section 6.01 Events of Default 22 Section 6.02 Collection of Indebtedness and Suits for Enforcement by Trustee 24 1 This Table of Contents does not constitute part of the Indenture and shall not have any bearing on the interpretation of any of its terms or provisions. Section 6.03 Application of Moneys Collected 25 Section 6.04 Limitation on Suits 25 Section 6.05 Rights and Remedies Cumulative; Delay or Omission Not Waiver 26 Section 6.06 Control by Securityholders 27 Section 6.07 Undertaking to Pay Costs 27 ARTICLE 7 CONCERNING THE TRUSTEE 28 Section 7.01 Certain Duties and Responsibilities of Trustee 28 Section 7.02 Certain Rights of Trustee 29 30 Section 7.03 Trustee Not Responsible for Recitals or Issuance or Securities 30 32 Section 7.04 May Hold Securities 31 32 Section 7.05 Moneys Held in Trust 31 32 Section 7.06 Compensation and Reimbursement 31 32 Section 7.07 Reliance on Officer’s Certificate or Opinion of Counsel 32 33 Section 7.08 Disqualification; Conflicting Interests 32 33 Section 7.09 Corporate Trustee Required; Eligibility 32 34 Section 7.10 Resignation and Removal; Appointment of Successor 33 34 Section 7.11 Acceptance of Appointment By Successor 34 35 Section 7.12 Merger, Conversion, Consolidation or Succession to Business 35 36 Section 7.13 Preferential Collection of Claims Against the Company 35 37 Section 7.14 Notice of Default 36 37 ARTICLE 8 CONCERNING THE SECURITYHOLDERS 36 37 Section 8.01 Evidence of Action by Securityholders 36 37 Section 8.02 Proof of Execution by Securityholders 36 38 Section 8.03 Who May be Deemed Owners 37 38 Section 8.04 Certain Securities Owned by Company Disregarded 37 38 Section 8.05 Actions Binding on Future Securityholders 37 39 ARTICLE 9 SUPPLEMENTAL INDENTURES 38 39 Section 9.01 Supplemental Indentures Without the Consent of Securityholders 38 39 Section 9.02 Supplemental Indentures With Consent of Securityholders 39 40 Section 9.03 Effect of Supplemental Indentures 39 41 Section 9.04 Securities Affected by Supplemental Indentures 40 41 Section 9.05 Execution of Supplemental Indentures 40 41 ARTICLE 10 SUCCESSOR ENTITY 40 42 Section 10.01 Company May Consolidate, Etc 40 Etc. 42 Section 10.02 Successor Entity Substituted 41 43 ARTICLE 11 SATISFACTION AND DISCHARGE 42 43 Section 11.01 Satisfaction and Discharge of Indenture 42 43 Section 11.02 Discharge of Obligations 42 44 Section 11.03 Deposited Moneys to be Held in Trust 42 44 Section 11.04 Payment of Moneys Held by Paying Agents 43 44 Section 11.05 Repayment to Company 43 44 ARTICLE 12 IMMUNITY OF INCORPORATORS, STOCKHOLDERS, OFFICERS AND DIRECTORS 43 45 Section 12.01 No Recourse 43 45 ARTICLE 13 MISCELLANEOUS PROVISIONS 44 45 Section 13.01 Effect on Successors and Assigns 44 45 Section 13.02 Actions by Successor 44 45 Section 13.03 Surrender of Company Powers 44 45 Section 13.04 Notices 44 46 Section 13.05 Governing Law; Jury Trial Waiver 45 46 Section 13.06 Treatment of Securities as Debt 45 46 Section 13.07 Certificates and Opinions as to Conditions Precedent 45 46 Section 13.08 Payments on Business Days 45 47 Section 13.09 Conflict with Trust Indenture Act 46 47 Section 13.10 Counterparts 46 47 Section 13.11 Separability 46 47 Section 13.12 Compliance Certificates 46 47 Section 13.13 USA PATRIOT ACT 46 48 Section 13.14 Calculations 47 48 TRUST INDENTURE ACT CROSS-REFERENCE TABLE A-1 INDENTURE INDENTURE, dated as of [●]July 19, 201 2019, among UNUM THERAPEUTICS INC.REPLIGEN CORPORATION, a Delaware corporation (the “Company”), and [TRUSTEE] WILMINGTON TRUST, NATIONAL ASSOCIATION, a national banking association as trustee (the “Trustee”):

SECURITYHOLDERS' LISTS AND REPORTS. BY THE COMPANY AND THE TRUSTEE 20 Section 5.01 Company to Furnish Trustee Names and Addresses of Securityholders 20 Section 5.02 Preservation Of Information; Communications With Securityholders 21 Section 5.03 Reports by the Company 21 Section 5.04 Reports by the Trustee 21 ARTICLE 6 REMEDIES OF THE TRUSTEE AND SECURITYHOLDERS ON EVENT OF DEFAULT 22 Section 6.01 Events of Default 22 Section 6.02 Collection of Indebtedness and Suits for Enforcement by Trustee 24 1 This Table of Contents does not constitute part of the Indenture and shall not have any bearing on the interpretation of any of its terms or provisions. Section 6.03 Application of Moneys Collected 25 Section 6.04 Limitation on Suits 25 Section 6.05 Rights and Remedies Cumulative; Delay or Omission Not Waiver 26 Section 6.06 Control by Securityholders 27 Section 6.07 Undertaking to Pay Costs 27 ARTICLE 7 CONCERNING THE TRUSTEE 28 Section 7.01 Certain Duties and Responsibilities of Trustee 28 Section 7.02 Certain Rights of Trustee 29 Section 7.03 Trustee Not Responsible for Recitals or Issuance or Securities 30 Section 7.04 May Hold Securities 31 Section 7.05 Moneys Held in Trust 31 Section 7.06 Compensation and Reimbursement 31 Section 7.07 Reliance on Officer’s Certificate or Opinion of Counsel 32 Section 7.08 Disqualification; Conflicting Interests 32 Section 7.09 Corporate Trustee Required; Eligibility 32 Section 7.10 Resignation and Removal; Appointment of Successor 33 Section 7.11 Acceptance of Appointment By Successor 34 Section 7.12 Merger, Conversion, Consolidation or Succession to Business 35 Section 7.13 Preferential Collection of Claims Against the Company 35 Section 7.14 Notice of Default 36 ARTICLE 8 CONCERNING THE SECURITYHOLDERS 36 Section 8.01 Evidence of Action by Securityholders 36 Section 8.02 Proof of Execution by Securityholders 36 Section 8.03 Who May be Deemed Owners 37 Section 8.04 Certain Securities Owned by Company Disregarded 37 Section 8.05 Actions Binding on Future Securityholders 37 ARTICLE 9 SUPPLEMENTAL INDENTURES 38 Section 9.01 Supplemental Indentures Without the Consent of Securityholders 38 Section 9.02 Supplemental Indentures With Consent of Securityholders 39 Section 9.03 Effect of Supplemental Indentures 39 Section 9.04 Securities Affected by Supplemental Indentures 40 Section 9.05 Execution of Supplemental Indentures 40 ARTICLE 10 SUCCESSOR ENTITY 40 Section 10.01 Company May Consolidate, Etc 40 Section 10.02 Successor Entity Substituted 41 ARTICLE 11 SATISFACTION AND DISCHARGE 42 Section 11.01 Satisfaction and Discharge of Indenture 42 Section 11.02 Discharge of Obligations 42 Section 11.03 Deposited Moneys to be Held in Trust 42 Section 11.04 Payment of Moneys Held by Paying Agents 43 Section 11.05 Repayment to Company 43 ARTICLE 12 IMMUNITY OF INCORPORATORS, STOCKHOLDERS, OFFICERS AND DIRECTORS 43 Section 12.01 No Recourse 43 ARTICLE 13 MISCELLANEOUS PROVISIONS 44 Section 13.01 Effect on Successors and Assigns 44 Section 13.02 Actions by Successor 44 Section 13.03 Surrender of Company Powers 44 Section 13.04 Notices 44 Section 13.05 Governing Law; Jury Trial Waiver 45 Section 13.06 Treatment of Securities as Debt 45 Section 13.07 Certificates and Opinions as to Conditions Precedent 45 Section 13.08 Payments on Business Days 45 Section 13.09 Conflict with Trust Indenture Act 46 Section 13.10 Counterparts 46 Section 13.11 Separability 46 Section 13.12 Compliance Certificates 46 Section 13.13 USA PATRIOT ACT 46 Section 13.14 Calculations 47 TRUST INDENTURE ACT CROSS-REFERENCE TABLE A-1 INDENTURE INDENTURE, dated as of [●•], 201 , among UNUM THERAPEUTICS INTELLIA THERAPEUTICS, INC., a Delaware corporation (the “Company”), and [TRUSTEE] as trustee (the “Trustee”):

SECURITYHOLDERS' LISTS AND REPORTS. BY THE COMPANY AND THE TRUSTEE 20 12 Section 5.01 Company to Furnish Trustee Names and Addresses of Securityholders 20 12 Section 5.02 Preservation Of Information; Communications With Securityholders 21 13 Section 5.03 Reports by the Company 21 13 Section 5.04 Reports by the Trustee 21 13 ARTICLE 6 REMEDIES OF THE TRUSTEE AND SECURITYHOLDERS ON EVENT OF DEFAULT 22 13 Section 6.01 Events of Default 22 13 Section 6.02 Collection of Indebtedness and Suits for Enforcement by Trustee 24 1 This Table of Contents does not constitute part of the Indenture and shall not have any bearing on the interpretation of any of its terms or provisions. 14 Section 6.03 Application of Moneys Collected 25 15 Section 6.04 Limitation on Suits 25 16 Section 6.05 Rights and Remedies Cumulative; Delay or Omission Not Waiver 26 16 Section 6.06 Control by Securityholders 27 16 Section 6.07 Undertaking to Pay Costs 27 17 ARTICLE 7 CONCERNING THE TRUSTEE 28 17 Section 7.01 Certain Duties and Responsibilities of Trustee 28 17 Section 7.02 Certain Rights of Trustee 29 18 Section 7.03 Trustee Not Responsible for Recitals or Issuance or Securities 30 18 Section 7.04 May Hold Securities 31 19 Section 7.05 Moneys Held in Trust 31 19 Section 7.06 Compensation and Reimbursement 31 19 Section 7.07 Reliance on Officer’s Certificate or Opinion of Counsel 32 19 Section 7.08 Disqualification; Conflicting Interests 32 20 Section 7.09 Corporate Trustee Required; Eligibility 32 20 Section 7.10 Resignation and Removal; Appointment of Successor 33 20 Section 7.11 Acceptance of Appointment By Successor 34 21 Section 7.12 Merger, Conversion, Consolidation or Succession to Business 35 21 Section 7.13 Preferential Collection of Claims Against the Company 35 22 Section 7.14 Notice of Default 36 22 ARTICLE 8 CONCERNING THE SECURITYHOLDERS 36 22 Section 8.01 Evidence of Action by Securityholders 36 22 Section 8.02 Proof of Execution by Securityholders 36 22 Section 8.03 Who May be Deemed Owners 37 22 Section 8.04 Certain Securities Owned by Company Disregarded 37 23 Section 8.05 Actions Binding on Future Securityholders 37 23 ARTICLE 9 SUPPLEMENTAL INDENTURES 38 23 Section 9.01 Supplemental Indentures Without the Consent of Securityholders 38 23 Section 9.02 Supplemental Indentures With Consent of Securityholders 39 24 Section 9.03 Effect of Supplemental Indentures 39 24 Section 9.04 Securities Affected by Supplemental Indentures 40 24 Section 9.05 Execution of Supplemental Indentures 40 24 ARTICLE 10 SUCCESSOR ENTITY 40 25 Section 10.01 Company May Consolidate, Etc 40 25 Section 10.02 Successor Entity Substituted 41 25 ARTICLE 11 SATISFACTION AND DISCHARGE 42 25 Section 11.01 Satisfaction and Discharge of Indenture 42 25 Section 11.02 Discharge of Obligations 42 26 Section 11.03 Deposited Moneys to be Held in Trust 42 26 Section 11.04 Payment of Moneys Held by Paying Agents 43 26 Section 11.05 Repayment to Company 43 26 ARTICLE 12 IMMUNITY OF INCORPORATORS, STOCKHOLDERS, OFFICERS AND DIRECTORS 43 26 Section 12.01 No Recourse 43 26 ARTICLE 13 MISCELLANEOUS PROVISIONS 44 27 Section 13.01 Effect on Successors and Assigns 44 27 Section 13.02 Actions by Successor 44 27 Section 13.03 Surrender of Company Powers 44 27 Section 13.04 Notices 44 27 Section 13.05 Governing Law; Jury Trial Waiver 45 27 Section 13.06 Treatment of Securities as Debt 45 27 Section 13.07 Certificates and Opinions as to Conditions Precedent 45 27 Section 13.08 Payments on Business Days 45 28 Section 13.09 Conflict with Trust Indenture Act 46 28 Section 13.10 Counterparts 46 28 Section 13.11 Separability 46 28 Section 13.12 Compliance Certificates 46 28 Section 13.13 USA PATRIOT ACT 46 28 Section 13.14 Calculations 47 28 ARTICLE 14 SUBORDINATION OF SECURITIES 28 TRUST INDENTURE ACT CROSS-REFERENCE TABLE A-1 30 INDENTURE INDENTURE, dated as of [●•], 201 202[•] , among UNUM FORMA THERAPEUTICS HOLDINGS, INC., a Delaware corporation (the “Company”), and [TRUSTEE] as trustee (the “Trustee”):

SECURITYHOLDERS' LISTS AND REPORTS. BY THE COMPANY AND THE TRUSTEE 20 Section 5.01 Company to Furnish Trustee Names and Addresses of Securityholders 20 Section 5.02 Preservation Of Information; Communications With Securityholders 21 20 Section 5.03 Reports by the Company 21 Section 5.04 Reports by the Trustee 21 ARTICLE 6 REMEDIES OF THE TRUSTEE AND SECURITYHOLDERS ON EVENT OF DEFAULT 22 Section 6.01 Events of Default 22 Section 6.02 Collection of Indebtedness and Suits for Enforcement by Trustee 24 1 This Table of Contents does not constitute part of the Indenture and shall not have any bearing on the interpretation of any of its terms or provisions. Section 6.03 Application of Moneys Collected 25 Section 6.04 Limitation on Suits 25 Section 6.05 Rights and Remedies Cumulative; Delay or Omission Not Waiver 26 Section 6.06 Control by Securityholders 27 26 Section 6.07 Undertaking to Pay Costs 27 ARTICLE 7 CONCERNING THE TRUSTEE 28 27 Section 7.01 Certain Duties and Responsibilities of Trustee 28 27 Section 7.02 Certain Rights of Trustee 29 Section 7.03 Trustee Not Responsible for Recitals or Issuance or Securities 30 Section 7.04 May Hold Securities 31 Section 7.05 Moneys Held in Trust 31 Section 7.06 Compensation and Reimbursement 31 Section 7.07 Reliance on Officer’s Certificate or Opinion of Counsel 32 Section 7.08 Disqualification; Conflicting Interests 32 Section 7.09 Corporate Trustee Required; Eligibility 32 Section 7.10 Resignation and Removal; Appointment of Successor 33 Section 7.11 Acceptance of Appointment By Successor 34 Section 7.12 Merger, Conversion, Consolidation or Succession to Business 35 Section 7.13 Preferential Collection of Claims Against the Company 35 Section 7.14 Notice of Default 36 35 ARTICLE 8 CONCERNING THE SECURITYHOLDERS 36 Section 8.01 Evidence of Action by Securityholders 36 Section 8.02 Proof of Execution by Securityholders 36 Section 8.03 Who May be Deemed Owners 37 Section 8.04 Certain Securities Owned by Company Disregarded 37 Section 8.05 Actions Binding on Future Securityholders 37 ARTICLE 9 SUPPLEMENTAL INDENTURES 38 Section 9.01 Supplemental Indentures Without the Consent of Securityholders 38 Section 9.02 Supplemental Indentures With Consent of Securityholders 39 Section 9.03 Effect of Supplemental Indentures 39 Section 9.04 Securities Affected by Supplemental Indentures 40 39 Section 9.05 Execution of Supplemental Indentures 40 ARTICLE 10 SUCCESSOR ENTITY 40 Section 10.01 Company May Consolidate, Etc 40 Section 10.02 Successor Entity Substituted 41 ARTICLE 11 SATISFACTION AND DISCHARGE 42 41 Section 11.01 Satisfaction and Discharge of Indenture 42 41 Section 11.02 Discharge of Obligations 42 Section 11.03 Deposited Moneys to be Held in Trust 42 Section 11.04 Payment of Moneys Held by Paying Agents 43 Section 11.05 Repayment to Company 43 ARTICLE 12 IMMUNITY OF INCORPORATORS, STOCKHOLDERS, OFFICERS AND DIRECTORS 43 Section 12.01 No Recourse 43 ARTICLE 13 MISCELLANEOUS PROVISIONS 44 Section 13.01 Effect on Successors and Assigns 44 Section 13.02 Actions by Successor 44 Section 13.03 Surrender of Company Powers 44 Section 13.04 Notices 44 Section 13.05 Governing Law; Jury Trial Waiver 45 44 Section 13.06 Treatment of Securities as Debt 45 Section 13.07 Certificates and Opinions as to Conditions Precedent 45 Section 13.08 Payments on Business Days 45 Section 13.09 Conflict with Trust Indenture Act 46 Section 13.10 Counterparts 46 Section 13.11 Separability 46 Section 13.12 Compliance Certificates 46 Section 13.13 USA PATRIOT ACT 46 Section 13.14 Calculations 47 46 TRUST INDENTURE ACT CROSS-REFERENCE TABLE A-1 INDENTURE INDENTURE, dated as of [●]June 10, 201 2019, among UNUM THERAPEUTICS between ALTAIR ENGINEERING INC., a Delaware corporation (the “Company”), and [TRUSTEE] U.S. BANK NATIONAL ASSOCIATION, a national banking association as trustee (the “Trustee”):

SECURITYHOLDERS' LISTS AND REPORTS. BY THE COMPANY AND THE TRUSTEE 20 Section 5.01 Company to Furnish Trustee Names and Addresses of Securityholders 20 Section 5.02 Preservation Of Information; Communications With Securityholders 21 20 Section 5.03 Reports by the Company 21 Section 5.04 Reports by the Trustee 21 ARTICLE 6 REMEDIES OF THE TRUSTEE AND SECURITYHOLDERS ON EVENT OF DEFAULT 22 Section 6.01 Events of Default 22 Section 6.02 Collection of Indebtedness and Suits for Enforcement by Trustee 24 1 This Table of Contents does not constitute part of the Indenture and shall not have any bearing on the interpretation of any of its terms or provisions. Section 6.03 Application of Moneys Collected 25 Section 6.04 Limitation on Suits 25 Section 6.05 Rights and Remedies Cumulative; Delay or Omission Not Waiver 26 Section 6.06 Control by Securityholders 27 26 Section 6.07 Undertaking to Pay Costs 27 ARTICLE 7 CONCERNING THE TRUSTEE 28 27 Section 7.01 Certain Duties and Responsibilities of Trustee 28 27 Section 7.02 Certain Rights of Trustee 29 Section 7.03 Trustee Not Responsible for Recitals or Issuance or Securities 30 Section 7.04 May Hold Securities 31 Section 7.05 Moneys Held in Trust 31 Section 7.06 Compensation and Reimbursement 31 Section 7.07 Reliance on Officer’s Certificate or Opinion of Counsel 32 Section 7.08 Disqualification; Conflicting Interests 32 Section 7.09 Corporate Trustee Required; Eligibility 32 Section 7.10 Resignation and Removal; Appointment of Successor 33 Section 7.11 Acceptance of Appointment By Successor 34 Section 7.12 Merger, Conversion, Consolidation or Succession to Business 35 Section 7.13 Preferential Collection of Claims Against the Company 35 Section 7.14 Notice of Default 36 35 ARTICLE 8 CONCERNING THE SECURITYHOLDERS 36 Section 8.01 Evidence of Action by Securityholders 36 Section 8.02 Proof of Execution by Securityholders 36 Section 8.03 Who May be Deemed Owners 37 Section 8.04 Certain Securities Owned by Company Disregarded 37 Section 8.05 Actions Binding on Future Securityholders 37 ARTICLE 9 SUPPLEMENTAL INDENTURES 38 Section 9.01 Supplemental Indentures Without the Consent of Securityholders 38 Section 9.02 Supplemental Indentures With Consent of Securityholders 39 Section 9.03 Effect of Supplemental Indentures 39 Section 9.04 Securities Affected by Supplemental Indentures 40 39 Section 9.05 Execution of Supplemental Indentures 40 ARTICLE 10 SUCCESSOR ENTITY 40 Section 10.01 Company May Consolidate, Etc 40 Section 10.02 Successor Entity Substituted 41 ARTICLE 11 SATISFACTION AND DISCHARGE 42 41 Section 11.01 Satisfaction and Discharge of Indenture 42 41 Section 11.02 Discharge of Obligations 42 Section 11.03 Deposited Moneys to be Held in Trust 42 Section 11.04 Payment of Moneys Held by Paying Agents 43 Section 11.05 Repayment to Company 43 ARTICLE 12 IMMUNITY OF INCORPORATORS, STOCKHOLDERS, OFFICERS AND DIRECTORS 43 Section 12.01 No Recourse 43 ARTICLE 13 MISCELLANEOUS PROVISIONS 44 Section 13.01 Effect on Successors and Assigns 44 Section 13.02 Actions by Successor 44 Section 13.03 Surrender of Company Powers 44 Section 13.04 Notices 44 Section 13.05 Governing Law; Jury Trial Waiver 45 44 Section 13.06 Treatment of Securities as Debt 45 Section 13.07 Certificates and Opinions as to Conditions Precedent 45 Section 13.08 Payments on Business Days 45 Section 13.09 Conflict with Trust Indenture Act 46 45 Section 13.10 Counterparts 46 Section 13.11 Separability 46 Section 13.12 Compliance Certificates 46 Section 13.13 USA PATRIOT ACT 46 Section 13.14 Calculations 47 46 TRUST INDENTURE ACT CROSS-REFERENCE TABLE A-1 2 INDENTURE INDENTURE, dated as of [●]March 13, 201 2018, among UNUM THERAPEUTICS GUIDEWIRE SOFTWARE, INC., a Delaware corporation (the “Company”), and [TRUSTEE] U.S. Bank National Association, a national banking association as trustee (the “Trustee”):

SECURITYHOLDERS' LISTS AND REPORTS. BY THE COMPANY AND THE TRUSTEE 20 8 Section 5.01 Company to Furnish Trustee Names and Addresses of Securityholders 20 8 Section 5.02 Preservation Of Information; Communications With Securityholders 21 8 Section 5.03 Reports by the Company 21 8 Section 5.04 Reports by the Trustee 21 8 ARTICLE 6 REMEDIES OF THE TRUSTEE AND SECURITYHOLDERS ON EVENT OF DEFAULT 22 9 Section 6.01 Events of Default 22 9 Section 6.02 Collection of Indebtedness and Suits for Enforcement by Trustee 24 1 This Table of Contents does not constitute part of the Indenture and shall not have any bearing on the interpretation of any of its terms or provisions. 9 Section 6.03 Application of Moneys Collected 25 10 Section 6.04 Limitation on Suits 25 10 Section 6.05 Rights and Remedies Cumulative; Delay or Omission Not Waiver 26 10 Section 6.06 Control by Securityholders 27 10 Section 6.07 Undertaking to Pay Costs 27 10 ARTICLE 7 CONCERNING THE TRUSTEE 28 11 Section 7.01 Certain Duties and Responsibilities of Trustee 28 11 Section 7.02 Certain Rights of Trustee 29 11 Section 7.03 Trustee Not Responsible for Recitals or Issuance or Securities 30 12 Section 7.04 May Hold Securities 31 12 Section 7.05 Moneys Held in Trust 31 12 Section 7.06 Compensation and Reimbursement 31 12 Section 7.07 Reliance on Officer’s Certificate or Opinion of Counsel 32 12 Section 7.08 Disqualification; Conflicting Interests 32 12 Section 7.09 Corporate Trustee Required; Eligibility 32 12 Section 7.10 Resignation and Removal; Appointment of Successor 33 12 Section 7.11 Acceptance of Appointment By Successor 34 13 Section 7.12 Merger, Conversion, Consolidation or Succession to Business 35 13 Section 7.13 Preferential Collection of Claims Against the Company 35 13 Section 7.14 Notice of Default 36 14 ARTICLE 8 CONCERNING THE SECURITYHOLDERS 36 14 Section 8.01 Evidence of Action by Securityholders 36 14 Section 8.02 Proof of Execution by Securityholders 36 14 Section 8.03 Who May be Deemed Owners 37 14 Section 8.04 Certain Securities Owned by Company Disregarded 37 14 Section 8.05 Actions Binding on Future Securityholders 37 14 ARTICLE 9 SUPPLEMENTAL INDENTURES 38 15 Section 9.01 Supplemental Indentures Without the Consent of Securityholders 38 15 Section 9.02 Supplemental Indentures With Consent of Securityholders 39 15 Section 9.03 Effect of Supplemental Indentures 39 15 Section 9.04 Securities Affected by Supplemental Indentures 40 15 Section 9.05 Execution of Supplemental Indentures 40 15 ARTICLE 10 SUCCESSOR ENTITY 40 16 Section 10.01 Company May Consolidate, Etc 40 Etc. 16 Section 10.02 Successor Entity Substituted 41 16 ARTICLE 11 SATISFACTION AND DISCHARGE 42 16 Section 11.01 Satisfaction and Discharge of Indenture 42 16 Section 11.02 Discharge of Obligations 42 16 Section 11.03 Deposited Moneys to be Held in Trust 42 16 Section 11.04 Payment of Moneys Held by Paying Agents 43 16 Section 11.05 Repayment to Company 43 16 ARTICLE 12 IMMUNITY OF INCORPORATORS, STOCKHOLDERS, OFFICERS AND DIRECTORS 43 17 Section 12.01 No Recourse 43 17 ARTICLE 13 MISCELLANEOUS PROVISIONS 44 17 Section 13.01 Effect on Successors and Assigns 44 17 Section 13.02 Actions by Successor 44 17 Section 13.03 Surrender of Company Powers 44 17 Section 13.04 Notices 44 17 Section 13.05 Governing Law; Jury Trial Waiver 45 Law 17 Section 13.06 Treatment of Securities as Debt 45 17 Section 13.07 Certificates and Opinions as to Conditions Precedent 45 17 Section 13.08 Payments on Business Days 45 18 Section 13.09 Conflict with Trust Indenture Act 46 18 Section 13.10 Counterparts 46 18 Section 13.11 Separability 46 18 Section 13.12 Compliance Certificates 46 Section 13.13 USA PATRIOT ACT 46 Section 13.14 Calculations 47 TRUST INDENTURE ACT CROSS-REFERENCE TABLE A-1 INDENTURE INDENTURE, dated as of [●], 201 , among UNUM THERAPEUTICS INC., a Delaware corporation (the “Company”), and [TRUSTEE] as trustee (the “Trustee”):18

SECURITYHOLDERS' LISTS AND REPORTS. BY THE COMPANY AND THE TRUSTEE 20 Section 5.01 Company to Furnish Trustee Names and Addresses of Securityholders 20 Section 5.02 Preservation Of Information; Communications With Securityholders 21 20 Section 5.03 Reports by the Company 21 20 Section 5.04 Reports by the Trustee 21 ARTICLE 6 REMEDIES OF THE TRUSTEE AND SECURITYHOLDERS ON EVENT OF DEFAULT 22 21 Section 6.01 Events of Default 22 21 Section 6.02 Collection of Indebtedness and Suits for Enforcement by Trustee 24 1 This Table of Contents does not constitute part of the Indenture and shall not have any bearing on the interpretation of any of its terms or provisions. 23 Section 6.03 Application of Moneys Collected 25 24 Section 6.04 Limitation on Suits 25 Section 6.05 Rights and Remedies Cumulative; Delay or Omission Not Waiver 26 25 Section 6.06 Control by Securityholders 27 26 TABLE OF CONTENTS (continued) Page Section 6.07 Undertaking to Pay Costs 27 26 ARTICLE 7 CONCERNING THE TRUSTEE 28 27 Section 7.01 Certain Duties and Responsibilities of Trustee 28 27 Section 7.02 Certain Rights of Trustee 29 28 Section 7.03 Trustee Not Responsible for Recitals or Issuance Recitals, Indenture or Securities 30 Section 7.04 May Hold Securities 31 30 Section 7.05 Moneys Held in Trust 31 30 Section 7.06 Compensation and Reimbursement 31 30 Section 7.07 Reliance on Officer’s Certificate or Opinion of Counsel 32 31 Section 7.08 Disqualification; Conflicting Interests 32 31 Section 7.09 Corporate Trustee Required; Eligibility 32 31 Section 7.10 Resignation and Removal; Appointment of Successor 33 32 Section 7.11 Acceptance of Appointment By Successor 34 33 Section 7.12 Merger, Conversion, Consolidation or Succession to Business 35 34 Section 7.13 Preferential Collection of Claims Against the Company 35 34 Section 7.14 Notice of Default 36 35 ARTICLE 8 CONCERNING THE SECURITYHOLDERS 36 35 Section 8.01 Evidence of Action by Securityholders 36 35 Section 8.02 Proof of Execution by Securityholders 36 Section 8.03 Who May be Deemed Owners 37 36 Section 8.04 Certain Securities Owned by Company Disregarded 37 36 Section 8.05 Actions Binding on Future Securityholders 37 36 ARTICLE 9 SUPPLEMENTAL INDENTURES 38 37 Section 9.01 Supplemental Indentures Without the Consent of Securityholders 38 37 Section 9.02 Supplemental Indentures With Consent of Securityholders 39 38 Section 9.03 Effect of Supplemental Indentures 39 Section 9.04 Securities Affected by Supplemental Indentures 40 39 Section 9.05 Execution of Supplemental Indentures 40 39 ARTICLE 10 SUCCESSOR ENTITY 40 Section 10.01 Company May Consolidate, Etc Etc. 40 Section 10.02 Successor Entity Substituted 41 40 ARTICLE 11 SATISFACTION AND DISCHARGE 42 41 Section 11.01 Satisfaction and Discharge of Indenture 42 41 Section 11.02 Discharge of Obligations 42 41 Section 11.03 Deposited Moneys to be Held in Trust 42 Section 11.04 Payment of Moneys Held by Paying Agents 43 42 Section 11.05 Repayment to Company 43 42 ARTICLE 12 IMMUNITY OF INCORPORATORS, STOCKHOLDERS, OFFICERS AND DIRECTORS 43 42 Section 12.01 No Recourse 43 42 ARTICLE 13 MISCELLANEOUS PROVISIONS 44 43 Section 13.01 Effect on Successors and Assigns 44 43 TABLE OF CONTENTS (continued) Page Section 13.02 Actions by Successor 44 43 Section 13.03 Surrender of Company Powers 44 43 Section 13.04 Notices 44 43 Section 13.05 Governing Law; Waiver of Jury Trial Waiver 45 Trial; Consent to Jurisdiction 44 Section 13.06 Treatment of Securities as Debt 45 Section 13.07 Certificates and Opinions as to Conditions Precedent 45 Section 13.08 Payments on Business Days 45 Section 13.09 Conflict with Trust Indenture Act 46 45 Section 13.10 Counterparts 46 Section 13.11 Separability 46 Section 13.12 Compliance Certificates 46 Section 13.13 USA PATRIOT ACT 46 Section 13.14 Calculations 47 TRUST INDENTURE ACT CROSS-REFERENCE TABLE A-1 INDENTURE INDENTURE, dated as of [●], 201 , among UNUM THERAPEUTICS INC., a Delaware corporation (the “Company”), and [TRUSTEE] as trustee (the “Trustee”):46

SECURITYHOLDERS' LISTS AND REPORTS. BY THE COMPANY AND THE TRUSTEE 20 13 Section 5.01 Company to Furnish Trustee Names and Addresses of Securityholders 20 13 Section 5.02 Preservation Of Information; Communications With Securityholders 21 13 Section 5.03 Reports by the Company 21 13 Section 5.04 Reports by the Trustee 21 13 ARTICLE 6 REMEDIES OF THE TRUSTEE AND SECURITYHOLDERS ON EVENT OF DEFAULT 22 14 Section 6.01 Events of Default 22 14 Section 6.02 Collection of Indebtedness and Suits for Enforcement by Trustee 24 1 This Table of Contents does not constitute part of the Indenture and shall not have any bearing on the interpretation of any of its terms or provisions. 15 Section 6.03 Application of Moneys Collected 25 16 Section 6.04 Limitation on Suits 25 16 Section 6.05 Rights and Remedies Cumulative; Delay or Omission Not Waiver 26 16 Section 6.06 Control by Securityholders 27 16 Section 6.07 Undertaking to Pay Costs 27 17 ARTICLE 7 CONCERNING THE TRUSTEE 28 17 Section 7.01 Certain Duties and Responsibilities of Trustee 28 17 Section 7.02 Certain Rights of Trustee 29 18 Section 7.03 Trustee Not Responsible for Recitals or Issuance or Securities 30 19 Section 7.04 May Hold Securities 31 19 Section 7.05 Moneys Held in Trust 31 19 Section 7.06 Compensation and Reimbursement 31 19 Section 7.07 Reliance on Officer’s Certificate or Opinion of Counsel 32 20 Section 7.08 Disqualification; Conflicting Interests 32 20 Section 7.09 Corporate Trustee Required; Eligibility 32 20 Section 7.10 Resignation and Removal; Appointment of Successor 33 20 Section 7.11 Acceptance of Appointment By Successor 34 21 Section 7.12 Merger, Conversion, Consolidation or Succession to Business 35 22 Section 7.13 Preferential Collection of Claims Against the Company 35 22 Section 7.14 Notice of Default 36 22 ARTICLE 8 CONCERNING THE SECURITYHOLDERS 36 22 Section 8.01 Evidence of Action by Securityholders 36 22 Section 8.02 Proof of Execution by Securityholders 36 23 Section 8.03 Who May be Deemed Owners 37 23 Section 8.04 Certain Securities Owned by Company Disregarded 37 23 Section 8.05 Actions Binding on Future Securityholders 37 23 ARTICLE 9 SUPPLEMENTAL INDENTURES 38 23 Section 9.01 Supplemental Indentures Without the Consent of Securityholders 38 23 Section 9.02 Supplemental Indentures With Consent of Securityholders 39 24 Section 9.03 Effect of Supplemental Indentures 39 24 Section 9.04 Securities Affected by Supplemental Indentures 40 25 Section 9.05 Execution of Supplemental Indentures 40 25 ARTICLE 10 SUCCESSOR ENTITY 40 25 Section 10.01 Company May Consolidate, Etc 40 Etc. 25 Section 10.02 Successor Entity Substituted 41 25 ARTICLE 11 SATISFACTION AND DISCHARGE 42 26 Section 11.01 Satisfaction and Discharge of Indenture 42 26 Section 11.02 Discharge of Obligations 42 26 Section 11.03 Deposited Moneys to be Held in Trust 42 26 Section 11.04 Payment of Moneys Held by Paying Agents 43 26 Section 11.05 Repayment to Company 43 27 ARTICLE 12 IMMUNITY OF INCORPORATORS, STOCKHOLDERS, OFFICERS AND DIRECTORS 43 27 Section 12.01 No Recourse 43 27 ARTICLE 13 MISCELLANEOUS PROVISIONS 44 27 Section 13.01 Effect on Successors and Assigns 44 27 Section 13.02 Actions by Successor 44 27 Section 13.03 Surrender of Company Powers 44 27 Section 13.04 Notices 44 27 Section 13.05 Governing Law; Jury Trial Waiver 45 Law 28 Section 13.06 Treatment of Securities as Debt 45 28 Section 13.07 Certificates and Opinions as to Conditions Precedent 45 28 Section 13.08 Payments on Business Days 45 28 Section 13.09 Conflict with Trust Indenture Act 46 28 Section 13.10 Counterparts 46 28 Section 13.11 Separability 46 28 Section 13.12 Compliance Certificates 46 Section 13.13 USA PATRIOT ACT 46 Section 13.14 Calculations 47 TRUST INDENTURE ACT CROSS-REFERENCE TABLE A-1 INDENTURE INDENTURE, dated as of [●], 201 , among UNUM THERAPEUTICS INC., a Delaware corporation (the “Company”), and [TRUSTEE] as trustee (the “Trustee”):29

SECURITYHOLDERS' LISTS AND REPORTS. BY THE COMPANY AND THE TRUSTEE 20 13 Section 5.01 Company to Furnish Trustee Names and Addresses of Securityholders 20 13 Section 5.02 Preservation Of Information; Communications With Securityholders 21 13 Section 5.03 Reports by the Company 21 13 Section 5.04 Reports by the Trustee 21 13 ARTICLE 6 REMEDIES OF THE TRUSTEE AND SECURITYHOLDERS ON EVENT OF DEFAULT 22 14 Section 6.01 Events of Default 22 14 Section 6.02 Collection of Indebtedness and Suits for Enforcement by Trustee 24 1 This Table of Contents does not constitute part of the Indenture and shall not have any bearing on the interpretation of any of its terms or provisions. 15 Section 6.03 Application of Moneys Collected 25 15 Section 6.04 Limitation on Suits 25 16 Section 6.05 Rights and Remedies Cumulative; Delay or Omission Not Waiver 26 16 Section 6.06 Control by Securityholders 27 16 Section 6.07 Undertaking to Pay Costs 27 17 ARTICLE 7 CONCERNING THE TRUSTEE 28 17 Section 7.01 Certain Duties and Responsibilities of Trustee 28 17 Section 7.02 Certain Rights of Trustee 29 18 Section 7.03 Trustee Not Responsible for Recitals or Issuance or Securities 30 19 Section 7.04 May Hold Securities 31 19 Section 7.05 Moneys Held in Trust 31 19 Section 7.06 Compensation and Reimbursement 31 19 Section 7.07 Reliance on Officer’s Certificate or Opinion of Counsel 32 20 Section 7.08 Disqualification; Conflicting Interests 32 20 Section 7.09 Corporate Trustee Required; Eligibility 32 20 Section 7.10 Resignation and Removal; Appointment of Successor 33 20 Section 7.11 Acceptance of Appointment By Successor 34 21 Section 7.12 Merger, Conversion, Consolidation or Succession to Business 35 22 Section 7.13 Preferential Collection of Claims Against the Company 35 22 Section 7.14 Notice of Default 36 22 ARTICLE 8 CONCERNING THE SECURITYHOLDERS 36 22 Section 8.01 Evidence of Action by Securityholders 36 22 Section 8.02 Proof of Execution by Securityholders 36 23 Section 8.03 Who May be Deemed Owners 37 23 Section 8.04 Certain Securities Owned by Company Disregarded 37 23 Section 8.05 Actions Binding on Future Securityholders 37 23 ARTICLE 9 SUPPLEMENTAL INDENTURES 38 24 Section 9.01 Supplemental Indentures Without the Consent of Securityholders 38 24 Section 9.02 Supplemental Indentures With Consent of Securityholders 39 24 Section 9.03 Effect of Supplemental Indentures 39 25 Section 9.04 Securities Affected by Supplemental Indentures 40 25 Section 9.05 Execution of Supplemental Indentures 40 25 ARTICLE 10 SUCCESSOR ENTITY 40 25 Section 10.01 Company May Consolidate, Etc 40 Etc. 25 Section 10.02 Successor Entity Substituted 41 26 ARTICLE 11 SATISFACTION AND DISCHARGE 42 26 Section 11.01 Satisfaction and Discharge of Indenture 42 26 Section 11.02 Discharge of Obligations 42 26 Section 11.03 Deposited Moneys to be Held in Trust 42 27 Section 11.04 Payment of Moneys Held by Paying Agents 43 27 Section 11.05 Repayment to Company 43 27 ARTICLE 12 IMMUNITY OF INCORPORATORS, STOCKHOLDERS, OFFICERS AND DIRECTORS 43 27 Section 12.01 No Recourse 43 27 ARTICLE 13 MISCELLANEOUS PROVISIONS 44 27 Section 13.01 Effect on Successors and Assigns 44 27 Section 13.02 Actions by Successor 44 27 Section 13.03 Surrender of Company Powers 44 28 Section 13.04 Notices 44 28 Section 13.05 Governing Law; Jury Trial Waiver 45 Law 28 Section 13.06 Treatment of Securities as Debt 45 28 Section 13.07 Certificates and Opinions as to Conditions Precedent 45 28 Section 13.08 Payments on Business Days 45 28 Section 13.09 Conflict with Trust Indenture Act 46 28 Section 13.10 Counterparts 46 29 Section 13.11 Separability 46 29 Section 13.12 Compliance Certificates 46 Section 13.13 USA PATRIOT ACT 46 Section 13.14 Calculations 47 TRUST INDENTURE ACT CROSS-REFERENCE TABLE A-1 INDENTURE INDENTURE, dated as of [●], 201 , among UNUM THERAPEUTICS INC., a Delaware corporation (the “Company”), and [TRUSTEE] as trustee (the “Trustee”):29

SECURITYHOLDERS' LISTS AND REPORTS. BY THE COMPANY AND THE TRUSTEE 20 Section 5.01 Company to Furnish Trustee Names and Addresses of Securityholders 20 Section 5.02 Preservation Of Information; Communications With Securityholders 21 Section 5.03 Reports by the Company 21 Section 5.04 Reports by the Trustee 21 ARTICLE 6 REMEDIES OF THE TRUSTEE AND SECURITYHOLDERS ON EVENT OF DEFAULT 22 21 Section 6.01 Events of Default 22 21 Section 6.02 Collection of Indebtedness and Suits for Enforcement by Trustee 24 1 This Table of Contents does not constitute part of the Indenture and shall not have any bearing on the interpretation of any of its terms or provisions. 23 Section 6.03 Application of Moneys Collected 25 Section 6.04 Limitation on Suits 25 Section 6.05 Rights and Remedies Cumulative; Delay or Omission Not Waiver 26 Section 6.06 Control by Securityholders 27 26 Section 6.07 Undertaking to Pay Costs 27 ARTICLE 7 CONCERNING THE TRUSTEE 28 27 Section 7.01 Certain Duties and Responsibilities of Trustee 28 27 Section 7.02 Certain Rights of Trustee 29 28 Section 7.03 Trustee Not Responsible for Recitals or Issuance or Securities 30 Section 7.04 May Hold Securities 31 30 Section 7.05 Moneys Held in Trust 31 30 Section 7.06 Compensation and Reimbursement 31 Section 7.07 Reliance on Officer’s Certificate or Opinion of Counsel 32 31 Section 7.08 Disqualification; Conflicting Interests 32 Section 7.09 Corporate Trustee Required; Eligibility 32 Section 7.10 Resignation and Removal; Appointment of Successor 33 32 TABLE OF CONTENTS (continued) Page Section 7.11 Acceptance of Appointment By Successor 34 33 Section 7.12 Merger, Conversion, Consolidation or Succession to Business 35 Section 7.13 Preferential Collection of Claims Against the Company 35 Section 7.14 Notice of Default 36 35 ARTICLE 8 CONCERNING THE SECURITYHOLDERS 36 35 Section 8.01 Evidence of Action by Securityholders 36 35 Section 8.02 Proof of Execution by Securityholders 36 Section 8.03 Who May be Deemed Owners 37 36 Section 8.04 Certain Securities Owned by Company Disregarded 37 36 Section 8.05 Actions Binding on Future Securityholders 37 ARTICLE 9 SUPPLEMENTAL INDENTURES 38 Section 9.01 Supplemental Indentures Without the Consent of Securityholders 38 Section 9.02 Supplemental Indentures With Consent of Securityholders 39 Section 9.03 Effect of Supplemental Indentures 39 Section 9.04 Securities Affected by Supplemental Indentures 40 Section 9.05 Execution of Supplemental Indentures 40 ARTICLE 10 SUCCESSOR ENTITY 40 Section 10.01 Company May Consolidate, Etc 40 Section 10.02 Successor Entity Substituted 41 ARTICLE 11 SATISFACTION AND DISCHARGE 42 Section 11.01 Satisfaction and Discharge of Indenture 42 Section 11.02 Discharge of Obligations 42 Section 11.03 Deposited Moneys to be Held in Trust 42 Section 11.04 Payment of Moneys Held by Paying Agents 43 Section 11.05 Repayment to Company 43 ARTICLE 12 IMMUNITY OF INCORPORATORS, STOCKHOLDERS, OFFICERS AND DIRECTORS 43 Section 12.01 No Recourse 43 ARTICLE 13 MISCELLANEOUS PROVISIONS 44 Section 13.01 Effect on Successors and Assigns 44 Section 13.02 Actions by Successor 44 Section 13.03 Surrender of Company Powers 44 Section 13.04 Notices 44 Section 13.05 Governing Law; Jury Trial Waiver 45 Section 13.06 Treatment of Securities as Debt 45 Section 13.07 Certificates and Opinions as to Conditions Precedent 45 Section 13.08 Payments on Business Days 45 Section 13.09 Conflict with Trust Indenture Act 46 Section 13.10 Counterparts 46 Section 13.11 Separability 46 Section 13.12 Compliance Certificates 46 Section 13.13 USA PATRIOT ACT 46 Section 13.14 Calculations 47 TRUST INDENTURE ACT CROSS-REFERENCE TABLE A-1 INDENTURE INDENTURE, dated as of [●], 201 , among UNUM THERAPEUTICS INC., a Delaware corporation (the “Company”), and [TRUSTEE] as trustee (the “Trustee”):37

SECURITYHOLDERS' LISTS AND REPORTS. BY THE COMPANY AND THE TRUSTEE 20 Section 5.01 Company to Furnish Trustee Names and Addresses of Securityholders 20 Section 5.02 Preservation Of Information; Communications With Securityholders 21 20 Section 5.03 Reports by the Company 21 Section 5.04 Reports by the Trustee 21 ARTICLE 6 REMEDIES OF THE TRUSTEE AND SECURITYHOLDERS ON EVENT OF DEFAULT 22 Section 6.01 Events of Default 22 Section 6.02 Collection of Indebtedness and Suits for Enforcement by Trustee 24 1 This Table of Contents does not constitute part of the Indenture and shall not have any bearing on the interpretation of any of its terms or provisions. Section 6.03 Application of Moneys Collected 25 Section 6.04 Limitation on Suits 25 Section 6.05 Rights and Remedies Cumulative; Delay or Omission Not Waiver 26 Section 6.06 Control by Securityholders 27 26 Section 6.07 Undertaking to Pay Costs 27 ARTICLE 7 CONCERNING THE TRUSTEE 28 27 Section 7.01 Certain Duties and Responsibilities of Trustee 28 27 Section 7.02 Certain Rights of Trustee 29 Section 7.03 Trustee Not Responsible for Recitals or Issuance or Securities 30 Section 7.04 May Hold Securities 31 Section 7.05 Moneys Held in Trust 31 Section 7.06 Compensation and Reimbursement 31 Section 7.07 Reliance on Officer’s Certificate or Opinion of Counsel 32 Section 7.08 Disqualification; Conflicting Interests 32 Section 7.09 Corporate Trustee Required; Eligibility 32 Section 7.10 Resignation and Removal; Appointment of Successor 33 Section 7.11 Acceptance of Appointment By Successor 34 Section 7.12 Merger, Conversion, Consolidation or Succession to Business 35 Section 7.13 Preferential Collection of Claims Against the Company 35 Section 7.14 Notice of Default 36 35 ARTICLE 8 CONCERNING THE SECURITYHOLDERS 36 Section 8.01 Evidence of Action by Securityholders 36 Section 8.02 Proof of Execution by Securityholders 36 Section 8.03 Who May be Deemed Owners 37 Section 8.04 Certain Securities Owned by Company Disregarded 37 Section 8.05 Actions Binding on Future Securityholders 37 ARTICLE 9 SUPPLEMENTAL INDENTURES 38 Section 9.01 Supplemental Indentures Without the Consent of Securityholders 38 Section 9.02 Supplemental Indentures With Consent of Securityholders 39 Section 9.03 Effect of Supplemental Indentures 39 Section 9.04 Securities Affected by Supplemental Indentures 40 39 Section 9.05 Execution of Supplemental Indentures 40 ARTICLE 10 SUCCESSOR ENTITY 40 Section 10.01 Company May Consolidate, Etc 40 Section 10.02 Successor Entity Substituted 41 ARTICLE 11 SATISFACTION AND DISCHARGE 42 41 Section 11.01 Satisfaction and Discharge of Indenture 42 41 Section 11.02 Discharge of Obligations 42 Section 11.03 Deposited Moneys to be Held in Trust 42 Section 11.04 Payment of Moneys Held by Paying Agents 43 Section 11.05 Repayment to Company 43 ARTICLE 12 IMMUNITY OF INCORPORATORS, STOCKHOLDERS, OFFICERS AND DIRECTORS 43 Section 12.01 No Recourse 43 ARTICLE 13 MISCELLANEOUS PROVISIONS 44 Section 13.01 Effect on Successors and Assigns 44 Section 13.02 Actions by Successor 44 Section 13.03 Surrender of Company Powers 44 Section 13.04 Notices 44 Section 13.05 Governing Law; Jury Trial Waiver 45 44 Section 13.06 Treatment of Securities as Debt 45 Section 13.07 Certificates and Opinions as to Conditions Precedent 45 Section 13.08 Payments on Business Days 45 Section 13.09 Conflict with Trust Indenture Act 46 45 Section 13.10 Counterparts 46 Section 13.11 Separability 46 Section 13.12 Compliance Certificates 46 Section 13.13 USA PATRIOT ACT 46 Section 13.14 Calculations 47 46 TRUST INDENTURE ACT CROSS-REFERENCE TABLE A-1 INDENTURE INDENTURE, dated as of [●], 201 , among UNUM THERAPEUTICS INC., a Delaware corporation (the “Company”), and [TRUSTEE] as trustee (the “Trustee”):