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13G Filing: EcoR1 Capital and Dicerna Pharmaceuticals Inc (DRNA)

Page 2 of 7 – SEC Filing

1. Names of Reporting Persons.

EcoR1 Capital, LLC

2. Check the Appropriate Box if
a Member of a Group (See Instructions)

(a) X


3. SEC Use Only
4. Citizenship or Place of Organization Delaware
Number of
Owned by
Each Reporting
Person With:
5. Sole Voting Power -0-
6. Shared Voting Power 4,836,547
7. Sole Dispositive Power -0-
8. Shared Dispositive Power 4,836,547
9. Aggregate Amount Beneficially Owned by Each Reporting Person 4,836,547
10. Check if the Aggregate Amount in Row (9) Excludes Certain Shares (See Instructions) ______
11. Percent of Class Represented by Amount in Row (9) 9.4%
12. Type of Reporting Person (See Instructions) OO
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