13D Filing: Bain Capital Life Sciences Fund, L.P. and Dicerna Pharmaceuticals Inc (DRNA)

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CUSIP No. 253031108 13D/A Page 5 of 5

SIGNATURES

After reasonable inquiry and to the best of its knowledge and belief, the undersigned certifies that the information set forth in this statement is true,
complete and correct.

Dated: September 18, 2017

Bain Capital Life Sciences Fund, L.P.

By: Bain Capital Life Sciences Partners, LP, its general partner

By: Bain Capital Life Sciences Investors, LLC, its general partner

By: /s/ Adam Koppel
Name: Adam Koppel
Title: Managing Director

BCIP Life Sciences Associates, LP

By: Boylston Coinvestors, LLC, its general partner

By: /s/ Adam Koppel
Name: Adam Koppel
Title: Authorized Signatory

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