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

1	Names of Reporting Persons. RA Capital Healthcare Fund, L.P.
2	Check the Appropriate Box if a Member of a Group (See Instructions)
	(a) [ ]
	(b) [ ]
3	SEC Use Only
4	Source of Funds (See Instructions): WC
5	Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e): [ ]
6	Citizenship or Place of Organization. Delaware

Number of Shares Beneficially Owned by Each Reporting Person With	7 Sole Voting Power 0
	8 Shared Voting Power 3,908,570
	9 Sole Dispositive Power 0
	10 Shared Dispositive Power 3,908,570

11	Aggregate Amount Beneficially Owned by Each Reporting Person 3,908,570
12	Check if the Aggregate Amount in Row (11) Excludes Certain Shares (See Instructions) [ ]
13	Percent of Class Represented by Amount in Row (11) 7.6%³
14	Type of Reporting Person (See Instructions) PN (Limited Partnership)

Page 4 of 6 – SEC Filing