o
|
Rule
13d-1(b)
|
x
|
Rule
13d-1(c)
|
o
|
Rule
13d-1(d)
|
CUSIP
No. 249908104
|
13G
|
Page
2
of 7
Pages
|
|
1.
|
Names
of Reporting Persons.
I.R.S.
Identification Nos. of above persons (entities only).
RA
Capital Management, LLC
|
||||
|
||||||
2.
|
Check
the Appropriate Box if a Member of a Group (See
Instructions)
|
|||||
(a)
|
o
|
|||||
(b)
|
o
|
|||||
|
||||||
3.
|
SEC
Use Only
|
|||||
|
||||||
4.
|
Citizenship
or Place of
Organization Massachusetts
|
|||||
|
||||||
Number
of
Shares
Beneficially
Owned
by
Each
Reporting
Person
With
|
5.
|
Sole
Voting Power
|
0
|
|||
|
||||||
6.
|
Shared
Voting Power
|
0
|
||||
|
||||||
7.
|
Sole
Dispositive Power
|
0
|
||||
|
||||||
8.
|
Shared
Dispositive Power
|
0
|
||||
|
||||||
9.
|
Aggregate
Amount Beneficially Owned by Each Reporting Person
0
|
|||||
|
||||||
10.
|
Check
if the Aggregate Amount in Row (9) Excludes
Certain
Shares (See Instructions)
|
o
|
||||
|
||||||
11.
|
Percent
of Class Represented by Amount in Row (9)
0.0%
|
|||||
|
||||||
12.
|
Type
of Reporting Person (See Instructions)
IA
|
|||||
|
CUSIP
No. 249908104
|
13G
|
Page 3
of 7
Pages
|
|
1.
|
Names
of Reporting Persons.
I.R.S.
Identification Nos. of above persons (entities only).
Peter
Kolchinsky
|
||||
2.
|
Check
the Appropriate Box if a Member of a Group (See
Instructions)
|
|||||
(a)
|
o
|
|||||
(b)
|
o
|
|||||
3.
|
SEC
Use Only
|
|||||
4.
|
Citizenship
or Place of
Organization United
States
|
|||||
Number
of
Shares
Beneficially
Owned
by
Each
Reporting
Person
With
|
5.
|
Sole
Voting Power
|
0
|
|||
6.
|
Shared
Voting Power
|
0
|
||||
7.
|
Sole
Dispositive Power
|
0
|
||||
8.
|
Shared
Dispositive Power
|
0
|
||||
9.
|
Aggregate
Amount Beneficially Owned by Each Reporting Person
0
|
|||||
10.
|
Check
if the Aggregate Amount in Row (9) Excludes
Certain
Shares (See Instructions)
|
o
|
||||
11.
|
Percent
of Class Represented by Amount in Row (9)
0.0%
|
|||||
12.
|
Type
of Reporting Person (See Instructions)
IN
|
|||||
CUSIP
No. 249908104
|
13G
|
Page 4
of 7
Pages
|
|
1.
|
Names
of Reporting Persons.
I.R.S.
Identification Nos. of above persons (entities only).
RA
Capital Healthcare Fund, L.P.
|
||||
2.
|
Check
the Appropriate Box if a Member of a Group (See
Instructions)
|
|||||
(a)
|
o
|
|||||
(b)
|
o
|
|||||
3.
|
SEC
Use Only
|
|||||
4.
|
Citizenship
or Place of
Organization Delaware
|
|||||
Number
of
Shares
Beneficially
Owned
by
Each
Reporting
Person
With
|
5.
|
Sole
Voting Power
|
0
|
|||
6.
|
Shared
Voting Power
|
0
|
||||
7.
|
Sole
Dispositive Power
|
0
|
||||
8.
|
Shared
Dispositive Power
|
0
|
||||
9.
|
Aggregate
Amount Beneficially Owned by Each Reporting Person
0
|
|||||
10.
|
Check
if the Aggregate Amount in Row (9) Excludes
Certain
Shares (See Instructions)
|
o
|
||||
11.
|
Percent
of Class Represented by Amount in Row (9)
0.0%
|
|||||
12.
|
Type
of Reporting Person (See Instructions)
PN
|
|||||
CUSIP
No. 249908104
|
|
Page 5
of 7
|
(a)
|
Amount
Beneficially Owned:
|
0
|
(b)
|
Percent
of Class:
|
0.0%
|
(c)
|
Number
of Shares as to which such person has:
|
(i)
|
sole
power to vote or to direct the vote:
|
0
|
|
(ii)
|
shared
power to vote or to direct the vote:
|
0
|
|
(iii)
|
sole
power to dispose or to direct the disposition of:
|
0
|
|
(iv)
|
shared
power to dispose or to direct the disposition of:
|
0
|
CUSIP
No. 249908104
|
|
Page 6
of 7
|
CUSIP
No. 249908104
|
|
Page 7
of 7
|
DATE:
FEBRUARY 14, 2011
|
||
RA
CAPITAL MANAGEMENT, LLC
|
||
By:
/s/ Peter Kolchinsky
|
||
Peter
Kolchinsky
|
||
Manager
|
||
RA
CAPITAL HEALTHCARE FUND, L.P.
|
||
By:
RA Capital Management, LLC
|
||
General
Partner
|
||
By:
/s/ Peter Kolchinsky
|
||
Peter
Kolchinsky
|
||
Manager
|
||
PETER
KOLCHINSKY
|
||
/s/
Peter Kolchinsky
|
RA
CAPITAL MANAGEMENT, LLC
|
||
By:
/s/ Peter Kolchinsky
|
||
Peter
Kolchinsky
|
||
Manager
|
||
RA
CAPITAL HEALTHCARE FUND, L.P.
|
||
By:
RA Capital Management, LLC
|
||
General
Partner
|
||
By:
/s/ Peter Kolchinsky
|
||
Peter
Kolchinsky, Manager
|
||
RA
Capital Management, LLC
|
||
PETER
KOLCHINSKY
|
||
/s/
Peter Kolchinsky
|