OMB
APPROVAL
|
|
OMB
Number:
|
3235-0145
|
Expires:
|
March
31, 2009
|
Estimated
average burden
hours
per response
|
10.4
|
o
|
Rule
13d-1(b)
|
x
|
Rule
13d-1(c)
|
o
|
Rule
13d-1(d)
|
CUSIP
No. 921659108
|
13G
|
Page
2 of 8
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 1,544,764
|
||||
6.
|
Shared
Voting
Power 0
|
|||||
7.
|
Sole
Dispositive Power 1,544,764
|
|||||
8.
|
Shared
Dispositive
Power 0
|
|||||
9.
|
Aggregate
Amount Beneficially Owned by Each Reporting Person
1,544,764
|
|||||
10.
|
Check
if the Aggregate Amount in Row (9) Excludes o
Certain
Shares (See Instructions)
|
|||||
11.
|
Percent
of Class Represented by Amount in Row (9)
5.8%
|
|||||
12.
|
Type
of Reporting Person (See Instructions)
IA
|
|||||
CUSIP
No. 921659108
|
13G
|
Page
3 of 8
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 1,544,764
|
||
|
||||
6.
|
Shared
Voting
Power 0
|
|||
|
||||
7.
|
Sole
Dispositive
Power 1,544,764
|
|||
|
||||
8.
|
Shared
Dispositive
Power 0
|
|||
|
||||
9.
|
Aggregate
Amount Beneficially Owned by Each Reporting Person
1,544,764
|
|||
|
||||
10.
|
Check
if the Aggregate Amount in Row (9) Excludes o
Certain
Shares (See Instructions)
|
|||
|
||||
11.
|
Percent
of Class Represented by Amount in Row (9)
5.8%
|
|||
|
||||
12.
|
Type
of Reporting Person (See Instructions)
IN
|
|||
|
CUSIP
No. 921659108
|
13G
|
Page
4 of 8
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 1,523,006
|
||
|
||||
6.
|
Shared
Voting
Power 0
|
|||
|
||||
7.
|
Sole
Dispositive
Power 1,523,006
|
|||
|
||||
8.
|
Shared
Dispositive
Power 0
|
|||
|
||||
9.
|
Aggregate
Amount Beneficially Owned by Each Reporting Person
1,523,006
|
|||
|
||||
10.
|
Check
if the Aggregate Amount in Row (9) Excludes o
Certain
Shares (See Instructions)
|
|||
|
||||
11.
|
Percent
of Class Represented by Amount in Row (9)
5.7%
|
|||
|
||||
12.
|
Type
of Reporting Person (See Instructions)
PN
|
|||
|
CUSIP
No. 921659108
|
13G
|
Page
5 of 8
Pages
|
|
1.
|
Names
of Reporting Persons.
I.R.S.
Identification Nos. of above persons (entities only).
RA
Capital Healthcare Fund II, 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 21,758
|
||
|
||||
6.
|
Shared
Voting
Power 0
|
|||
|
||||
7.
|
Sole
Dispositive
Power 21,758
|
|||
|
||||
8.
|
Shared
Dispositive
Power 0
|
|||
|
||||
9.
|
Aggregate
Amount Beneficially Owned by Each Reporting Person
21,758
|
|||
|
||||
10.
|
Check
if the Aggregate Amount in Row (9) Excludes o
Certain
Shares (See Instructions)
|
|||
|
||||
11.
|
Percent
of Class Represented by Amount in Row (9)
0.1%
|
|||
|
||||
12.
|
Type
of Reporting Person (See Instructions)
PN
|
|||
|
CUSIP
No. 921659108
|
|
Page
6 of 8
|
Item
3.
|
If
this statement is filed pursuant to §§240.13d-1(b) or 240.13d-2(b) or (c),
check whether the person filing is
a:
|
Item
4.
|
Ownership
|
CUSIP
No. 921659108
|
|
Page 7 of 8
|
Item
5.
|
Ownership
of Five Percent or Less of a Class
|
Item
6.
|
Ownership
of More than Five Percent on Behalf of Another
Person
|
Item
7.
|
Identification
and Classification of the Subsidiary Which Acquired the Security Being
Reported on By the Parent Holding Company or Control
Person
|
Item
8.
|
Identification
and Classification of Members of the
Group
|
Item
9.
|
Notice
of Dissolution of Group
|
Item
10.
|
Certification
|
CUSIP
No. 921659108
|
|
Page 8 of 8
|
DATE:
March 4,
2009
|
||
RA
CAPITAL HEALTHCARE FUND, L.P.
|
||
By:
|
RA
Capital Management, LLC
|
|
General
Partner
|
||
By:
|
/s/
Peter Kolchinsky
|
|
Peter Kolchinsky | ||
Manager | ||
RA
CAPITAL HEALTHCARE FUND II, L.P.
|
||
By:
|
RA
Capital Management, LLC
|
|
General
Partner
|
||
By:
|
/s/
Peter Kolchinsky
|
|
Peter Kolchinsky | ||
Manager | ||
RA
CAPITAL MANAGEMENT, LLC
|
||
By:
|
/s/
Peter Kolchinsky
|
|
Peter Kolchinsky | ||
Manager | ||
PETER
KOLCHINSKY
|
||
/s/
Peter
Kolchinsky
|
RA
CAPITAL HEALTHCARE FUND, L.P.
|
||
By:
|
/s/
Peter Kolchinsky
|
|
Peter
Kolchinsky, Manager
|
||
RA
Capital Management, LLC
|
||
RA
CAPITAL HEALTHCARE FUND II, L.P.
|
||
By:
|
/s/
Peter Kolchinsky
|
|
Peter
Kolchinsky, Manager
|
||
RA
Capital Management, LLC
|
||
RA
CAPITAL MANAGEMENT, LLC
|
||
By:
|
/s/
Peter Kolchinsky
|
|
Peter
Kolchinsky
|
||
Manager
|
||
PETER
KOLCHINSKY
|
||
/s/
Peter
Kolchinsky
|