Common use of Counterparts; Interpretation Clause in Contracts

Counterparts; Interpretation. This letter agreement may be executed in two or more counterparts (including via facsimile), each of which shall be deemed an original but all of which together shall be considered one and the same agreement. For purposes of this letter agreement, the term “including” shall mean “including, without limitation”. Very truly yours, Momenta Pharmaceuticals, Inc. By: /s/ ▇▇▇▇▇ ▇. ▇▇▇▇▇▇▇ Name: ▇▇▇▇▇ ▇. ▇▇▇▇▇▇▇ Title: President and Chief Executive Officer Agreed and Accepted: /s/ ▇▇▇▇▇▇▇▇▇ ▇▇▇▇▇▇▇▇ ▇▇▇▇▇▇▇▇▇ ▇▇▇▇▇▇▇▇

Counterparts; Interpretation. This letter agreement may be executed in two or more counterparts (including via facsimile), each of which shall be deemed an original but all of which together shall be considered one and the same agreement. For purposes of this letter agreement, the term “including” shall mean “including, without limitation”. Very truly yours, Momenta Pharmaceuticals, Inc. By: /s/ ▇C▇▇▇▇ ▇. ▇▇▇▇▇▇▇ Name: ▇C▇▇▇▇ ▇. ▇▇▇▇▇▇▇ Title: President and Chief Executive Officer Agreed and Accepted: /s/ A▇▇▇▇▇▇ ▇▇▇▇▇▇▇ A▇▇▇▇▇▇ ▇▇▇▇▇▇▇▇ ▇▇▇▇▇▇▇▇▇ ▇▇▇▇▇▇▇▇

Counterparts; Interpretation. This letter agreement may be executed in two or more counterparts (including via facsimile), each of which shall be deemed an original but all of which together shall be considered one and the same agreement. For purposes of this letter agreement, the term “including” shall mean “including, without limitation”. Very truly yours, Momenta Pharmaceuticals, ,Inc. By: /s/ ▇C▇▇▇▇ ▇. ▇▇▇▇▇▇▇ Name: ▇C▇▇▇▇ ▇. ▇▇▇▇▇▇▇ Title: President and Chief Executive Officer Agreed and Accepted: /s/ ▇▇▇▇▇▇▇▇▇ ▇▇▇▇▇▇▇▇ ▇▇▇▇▇▇▇▇▇ ▇▇▇▇▇▇▇▇Young Kwon Young Kwon

Counterparts; Interpretation. This letter agreement may be executed in two or more counterparts (including via facsimile), each of which shall be deemed an original but all of which together shall be considered one and the same agreement. For purposes of this letter agreement, the term “including” shall mean “including, without limitation”. Very truly yours, Momenta Pharmaceuticals, ,Inc. By: /s/ ▇C▇▇▇▇ ▇. ▇▇▇▇▇▇▇ Name: ▇C▇▇▇▇ ▇. ▇▇▇▇▇▇▇ Title: President and Chief Executive Officer Agreed and Accepted: /s/ S▇▇▇▇▇▇▇ ▇▇▇▇▇▇ S▇▇▇▇▇▇▇ ▇▇▇▇▇▇▇▇ ▇▇▇▇▇▇▇▇▇ ▇▇▇▇▇▇▇▇

Counterparts; Interpretation. This letter agreement may be executed in two or more counterparts (including via facsimile), each of which shall be deemed an original but all of which together shall be considered one and the same agreement. For purposes of this letter agreement, the term “including” shall mean “including, without limitation”. Very truly yours, Momenta Pharmaceuticals, Inc. By: /s/ ▇▇▇▇▇ ▇. ▇▇▇▇▇▇▇ Name: ▇▇▇▇▇ ▇. ▇▇▇▇▇▇▇ Title: President and Chief Executive Officer Agreed and Accepted: /s/ ▇▇▇▇▇▇▇▇▇ ▇▇▇▇▇-▇▇▇ ▇▇▇▇▇▇▇▇▇▇▇ ▇▇-▇▇▇▇▇▇▇ Beltramello

Counterparts; Interpretation. This letter agreement may be executed in two or more counterparts (including via facsimile), each of which shall be deemed an original but all of which together shall be considered one and the same agreement. For purposes of this letter agreement, the term “including” shall mean “including, without limitation”. Very truly yours, Momenta Pharmaceuticals, Inc. By: /s/ ▇▇▇▇▇ ▇. ▇▇▇▇▇▇▇ Name: ▇▇▇▇▇ ▇. ▇▇▇▇▇▇▇ Title: President and Chief Executive Officer Agreed and Accepted: /s/ ▇▇▇ ▇▇▇▇▇ ▇▇▇ ▇▇▇▇▇▇▇▇ ▇▇▇▇▇▇▇▇▇ ▇▇▇▇▇▇▇▇