CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY [***], HAS BEEN OMITTED BECAUSE IT IS NOT MATERIAL AND WOULD LIKELY CAUSE COMPETITIVE HARM TO SIGILON THERAPEUTICS, INC. IF PUBLICLY DISCLOSED.

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Exhibit 10.13

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CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY [***], HAS BEEN OMITTED BECAUSE IT IS NOT MATERIAL AND WOULD LIKELY CAUSE COMPETITIVE HARM TO SIGILON THERAPEUTICS, INC. IF PUBLICLY DISCLOSED.

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Massachusetts Institute of Technology

and

Sigilon Therapeutics, Inc.

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SIXTH AMENDMENT

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This Sixth Amendment (“Sixth Amendment”), effective as of February 1, 2022 (the “Sixth Amendment Effective Date”), is made by and between the Massachusetts Institute of Technology, a nonprofit research institution having a principal address at 00 Xxxxxxxxxxxxx Xxxxxx, Xxxxxxxxx, XX 00000 (“MIT”) and Sigilon Therapeutics, Inc. (fka Sigilon, Inc.) a Delaware corporation, having a principal address at 000 Xxxxxx Xxxxxx, Xxxxxxxxx, XX 00000 (“Company”) (each individually a “Party” and collectively the “Parties”), and amends that certain Exclusive Patent License Agreement between the Parties dated as of February 8, 2016, as amended (collectively, the “License Agreement”). Capitalized terms used herein without definition shall have the meaning given such terms in the License Agreement.

WHEREAS, MIT and Company wish to amend the License Agreement for the purposes of extending the diligence obligations related to the GROUP C PATENT RIGHTS under the terms and conditions set forth herein;

NOW, THEREFORE, the Parties agree to amend the License Agreement as follows:

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1.Section 3.4 of the License Agreement is hereby deleted and replaced with the following:

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“3.4Diligence Requirements for the GROUP C PATENT RIGHTS. Specifically, and in addition to Section 3.1, Company shall use commercially reasonable efforts, or shall cause its AFFILIATES or SUBLICENSEES to use commercially reasonable efforts, to develop LICENSED PRODUCTS and LICENSED PROCESSES covered by the GROUP C PATENT RIGHTS (“Group C Products”) and introduce such Group C Products into the commercial market; thereafter, COMPANY or its AFFILIATES or SUBLICENSEES shall make Group C

Products reasonably available to the public. Specifically, COMPANY or an AFFILIATE or SUBLICENSEE shall fulfill the following obligations:

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(a)COMPANY shall use commercially reasonable efforts to evaluate the GROUP C PATENT RIGHTS with the view toward creating a Group C Product. Specifically, by [***], COMPANY will provide MIT with a research and development plan, describing the major tasks to be achieved in order to develop and bring to market a Group C Product and that includes mutually acceptable deadlines for the diligence milestones described in clauses (c) through (f) of this Section 3.4, which deadlines, when agreed to by COMPANY and MIT shall be the applicable deadlines for such diligence milestones. Such deadlines shall be added by amendment to this Agreement by December 15, 2022.

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(b)Beginning in [***], within [***] days after the end of each calendar year, COMPANY shall furnish MIT with a written report (consistent with Section 5.l(a)) on the progress of its efforts during the immediately preceding calendar year to develop and commercialize Group C Products. The report shall also contain any updates to the research and development plan as well as a discussion of intended efforts, if applicable, for the year in which the report is submitted.

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(c)On or before a reasonable deadline to be determined by the parties by [***], COMPANY or an AFFILIATE or SUBLICENSEE shall develop a prototype Group C Product.

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(d)On or before a reasonable deadline to be determined by the parties by [***], COMPANY or an AFFILIATE or SUBLICENSEE shall have completed testing of a Group C Product in a relevant animal model.

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(e)On or before a reasonable deadline to be determined by the parties by [***], COMPANY or an AFFILIATE or SUBLICENSEE shall commence human clinical trials for a Group C Product.

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(f)On or before a reasonable deadline to be determined by the parties by [***], COMPANY or an AFFILIATE or SUBLICENSEE shall make a FIRST COMMERCIAL SALE of a Group C Product.

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In the event that MIT determines that COMPANY (or an AFFILIATE or SUBLICENSEE) has failed to fulfill any of its obligations under this Section 3.4, then MIT may

treat such failure as a material breach in accordance with Section 12.4(b), subject to Section 3.2. Any termination under Section 12.4(b) for breach of obligations under this Section 3.4 shall be limited to COMPANY's and its AFFILIATE's licenses and rights under the GROUP C PATENT RIGHTS.”

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2.Except as specifically amended herein, the terms and conditions of the License Agreement shall remain in full force and effect.

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{SIGNATURES TO FOLLOW}

IN WITNESS WHEREOF, the parties have caused this Sixth Amendment to be executed by their duly authorized representatives.

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MASSACHUSETTS INSTITUTE OF SIGILON THERAPEUTICS, INC.

TECHNOLOGY

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By:/s/ Xxxxxx Xxxxxx-Xxxxxxxxx​ ​ By: /s/ Xxxx Xxx​ ​ ​ ​

Name:Xxxxxx Xxxxxx-Nicholson Name: Xxxx Xxx

Title: Director, TLO Title: SVP, Business Development