13D Filing: RA Capital Management and Dicerna Pharmaceuticals Inc (DRNA)

Names of Reporting Persons.

RA Capital Healthcare Fund, L.P.

Source of Funds (See Instructions):

WC

Check if disclosure of legal proceedings
is required pursuant to Items 2(d) or 2(e):

¨

Citizenship or Place of Organization.
   Delaware

Number

of Shares

Beneficially

Owned by

Each

Reporting

Person With

7

Sole
Voting Power    0 shares

8

Shared
Voting Power    4,018,603 shares

9

Sole
Dispositive Power    0 shares

10

Shared
Dispositive Power    4,018,603 shares

Aggregate Amount Beneficially Owned by
Each Reporting Person

4,018,603 shares

Percent of Class Represented by Amount
in Row (11)

18.52%³

Type of Reporting Person (See Instructions)

PN (Limited Parntership)