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UNITED STATES
SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE 13G

Under the Securities Exchange Act of 1934
(Amendment No. 1)*

VIACELL, INC.
(Name of Issuer)
Common Stock
(Title of Class of Securities)
92554J105
(CUSIP Number)
December 31, 2006
(Date of Event Which Requires Filing of this Statement)

Check the appropriate box to designate the rule pursuant to which this Schedule is filed:

     o Rule 13d-1(b)

     o Rule 13d-1(c)

     þ Rule 13d-1(d)

* The remainder of this cover page shall be filled out for a reporting person’s initial filing on this form with respect to the subject class of securities, and for any subsequent amendment containing information which would alter the disclosures provided in a prior cover page.

The information required in the remainder of this cover page shall not be deemed to be “filed” for the purpose of Section 18 of the Securities Exchange Act of 1934 (“Act”) or otherwise subject to the liabilities of that section of the Act but shall be subject to all other provisions of the Act (however, see the Notes).

 
 

 

                     
CUSIP No.
  
92554J105 
  

 

           
1   NAMES OF REPORTING PERSONS:
   
  I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY): 
    BB BioVentures L.P.
     
2   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS):
  (a)   o
  (b)   þ
     
3   SEC USE ONLY:
   
   
     
4   CITIZENSHIP OR PLACE OF ORGANIZATION:
   
  Delaware
       
  5   SOLE VOTING POWER:
     
NUMBER OF   5,012,274(1)
       
SHARES 6   SHARED VOTING POWER:
BENEFICIALLY    
OWNED BY   0
       
EACH 7   SOLE DISPOSITIVE POWER:
REPORTING    
PERSON   5,012,274(1)
       
WITH: 8   SHARED DISPOSITIVE POWER:
     
    0
     
9   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON:
   
  5,012,274(1)
     
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):
   
  12.90%
     
12   TYPE OF REPORTING PERSON (SEE INSTRUCTIONS):
   
  PN
(1) Includes 433,333 shares issuable pursuant to warrants exercisable within 60 days of December 31, 2006.

Page 2 of 19

 

                     
CUSIP No.
  
92554J105 
  

 

           
1   NAMES OF REPORTING PERSONS:
   
  I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY): 
    MPM BioVentures Parallel Fund, L.P.
     
2   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS):
  (a)   o
  (b)   þ
     
3   SEC USE ONLY:
   
   
     
4   CITIZENSHIP OR PLACE OF ORGANIZATION:
   
  Delaware
       
  5   SOLE VOTING POWER:
     
NUMBER OF   335,628
       
SHARES 6   SHARED VOTING POWER:
BENEFICIALLY    
OWNED BY   0
       
EACH 7   SOLE DISPOSITIVE POWER:
REPORTING    
PERSON   335,628
       
WITH: 8   SHARED DISPOSITIVE POWER:
     
    0
     
9   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON:
   
  335,628
     
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):
   
  0.87%
     
12   TYPE OF REPORTING PERSON (SEE INSTRUCTIONS):
   
  PN

Page 3 of 19

 

                     
CUSIP No.
  
92554J105 
  

 

           
1   NAMES OF REPORTING PERSONS:
   
  I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY): 
    MPM Asset Management Investors 2000A LLC
     
2   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS):
  (a)   o
  (b)   þ
     
3   SEC USE ONLY:
   
   
     
4   CITIZENSHIP OR PLACE OF ORGANIZATION:
   
  Delaware
       
  5   SOLE VOTING POWER:
     
NUMBER OF   25,283
       
SHARES 6   SHARED VOTING POWER:
BENEFICIALLY    
OWNED BY   0
       
EACH 7   SOLE DISPOSITIVE POWER:
REPORTING    
PERSON   25,283
       
WITH: 8   SHARED DISPOSITIVE POWER:
     
    0
     
9   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON:
   
  25,283
     
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):
   
  0.07%
     
12   TYPE OF REPORTING PERSON (SEE INSTRUCTIONS):
   
  OO

Page 4 of 19

 

                     
CUSIP No.
  
92554J105 
  

 

           
1   NAMES OF REPORTING PERSONS:
   
  I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY): 
    MPM BioVentures II-QP, L.P.
     
2   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS):
  (a)   o
  (b)   þ
     
3   SEC USE ONLY:
   
   
     
4   CITIZENSHIP OR PLACE OF ORGANIZATION:
   
  Delaware
       
  5   SOLE VOTING POWER:
     
NUMBER OF   130,880
       
SHARES 6   SHARED VOTING POWER:
BENEFICIALLY    
OWNED BY   0
       
EACH 7   SOLE DISPOSITIVE POWER:
REPORTING    
PERSON   130,880
       
WITH: 8   SHARED DISPOSITIVE POWER:
     
    0
     
9   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON:
   
  130,880
     
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):
   
  0.34%
     
12   TYPE OF REPORTING PERSON (SEE INSTRUCTIONS):
   
  PN

Page 5 of 19

 

                     
CUSIP No.
  
92554J105 
  

 

           
1   NAMES OF REPORTING PERSONS:
   
  I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY): 
    MPM BioVentures II, L.P.
     
2   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS):
  (a)   o
  (b)   þ
     
3   SEC USE ONLY:
   
   
     
4   CITIZENSHIP OR PLACE OF ORGANIZATION:
   
  Delaware
       
  5   SOLE VOTING POWER:
     
NUMBER OF   14,444
       
SHARES 6   SHARED VOTING POWER:
BENEFICIALLY    
OWNED BY   0
       
EACH 7   SOLE DISPOSITIVE POWER:
REPORTING    
PERSON   14,444
       
WITH: 8   SHARED DISPOSITIVE POWER:
     
    0
     
9   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON:
   
  14,444
     
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):
   
  0.04%
     
12   TYPE OF REPORTING PERSON (SEE INSTRUCTIONS):
   
  PN

Page 6 of 19

 

                     
CUSIP No.
  
92554J105 
  

 

           
1   NAMES OF REPORTING PERSONS:
   
  I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY): 
    MPM BioVentures GmbH & Co. Parallel-Beteiligungs KG
     
2   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS):
  (a)   o
  (b)   þ
     
3   SEC USE ONLY:
   
   
     
4   CITIZENSHIP OR PLACE OF ORGANIZATION:
   
  Germany
       
  5   SOLE VOTING POWER:
     
NUMBER OF   46,089
       
SHARES 6   SHARED VOTING POWER:
BENEFICIALLY    
OWNED BY   0
       
EACH 7   SOLE DISPOSITIVE POWER:
REPORTING    
PERSON   46,089
       
WITH: 8   SHARED DISPOSITIVE POWER:
     
    0
     
9   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON:
   
  46,089
     
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):
   
  0.12%
     
12   TYPE OF REPORTING PERSON (SEE INSTRUCTIONS):
   
  PN

Page 7 of 19

 

                     
CUSIP No.
  
92554J105 
  

 

           
1   NAMES OF REPORTING PERSONS:
   
  I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY): 
    MPM Asset Management Investors 2001 LLC
     
2   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS):
  (a)   o
  (b)   þ
     
3   SEC USE ONLY:
   
   
     
4   CITIZENSHIP OR PLACE OF ORGANIZATION:
   
  Delaware
       
  5   SOLE VOTING POWER:
     
NUMBER OF   2,715
       
SHARES 6   SHARED VOTING POWER:
BENEFICIALLY    
OWNED BY   0
       
EACH 7   SOLE DISPOSITIVE POWER:
REPORTING    
PERSON   2,715
       
WITH: 8   SHARED DISPOSITIVE POWER:
     
    0
     
9   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON:
   
  2,715
     
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):
   
  0.01%
     
12   TYPE OF REPORTING PERSON (SEE INSTRUCTIONS):
   
  OO

Page 8 of 19

 

                     
CUSIP No.
  
92554J105 
  

 

           
1   NAMES OF REPORTING PERSONS:
   
  I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY): 
    MPM Founders LLC
     
2   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS):
  (a)   o
  (b)   þ
     
3   SEC USE ONLY:
   
   
     
4   CITIZENSHIP OR PLACE OF ORGANIZATION:
   
  Delaware
       
  5   SOLE VOTING POWER:
     
NUMBER OF   41,146
       
SHARES 6   SHARED VOTING POWER:
BENEFICIALLY    
OWNED BY   0
       
EACH 7   SOLE DISPOSITIVE POWER:
REPORTING    
PERSON   41,146
       
WITH: 8   SHARED DISPOSITIVE POWER:
     
    0
     
9   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON:
   
  41,146
     
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):
   
  0.11%
     
12   TYPE OF REPORTING PERSON (SEE INSTRUCTIONS):
   
  OO

Page 9 of 19

 

                     
CUSIP No.
  
92554J105 
  

 

           
1   NAMES OF REPORTING PERSONS:
   
  I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY): 
    Ansbert Gadicke
     
2   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS):
  (a)   o
  (b)   þ
     
3   SEC USE ONLY:
   
   
     
4   CITIZENSHIP OR PLACE OF ORGANIZATION:
   
  Delaware
       
  5   SOLE VOTING POWER:
     
NUMBER OF   20,000(1)
       
SHARES 6   SHARED VOTING POWER:
BENEFICIALLY    
OWNED BY   5,608,459(2)
       
EACH 7   SOLE DISPOSITIVE POWER:
REPORTING    
PERSON   20,000(1)
       
WITH: 8   SHARED DISPOSITIVE POWER:
     
    5,608,459(2)
     
9   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON:
   
  5,628,459(1)(2)
     
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):
   
  14.48%
     
12   TYPE OF REPORTING PERSON (SEE INSTRUCTIONS):
   
  IN
(1) Includes 20,000 shares issuable upon exercise of options within 60 days of December 31, 2006.
(2) The shares are held as follows: 5,012,274 by BB BioVentures, L.P. (“BB BioVentures”), 335,628 by MPM BioVentures Parallel Fund, L.P. (“MPM Parallel”), 25,283 by MPM Asset Management Investors 2000A LLC (“MPM Asset”), 130,880 by MPM BioVentures II-QP, L.P. (“BV QP”), 14,444 by MPM BioVentures II, L.P. (“BV II”), 46,089 by MPM BioVentures GmbH & Co. Parallel-Beteiligungs KG (“BV KG”), 2,715 by MPM Asset Management Investors 2001 LLC (“Asset 2001”) and 41,146 shares held by MPM Founders LLC. Also includes 433,333 shares issuable pursuant to warrants exercisable within 60 days of December 31, 2006 held by BB BioVentures. BB BioVentures is under common control with MPM Parallel and MPM Asset. BAB BioVentures L.P. (“BAB BV”), BAB BioVentures NV and MPM BioVentures I LLC (“BioVentures LLC”) are the direct and indirect general partners of BB BioVentures. MPM BioVentures I L.P. (“BioVentures LP”) and BioVentures LLC are the direct and indirect general partners of MPM Parallel. The Reporting person is a manager of BioVentures LLC and MPM Asset. MPM Asset Management II, L.P. (“AM II GP”) and MPM Asset Management II LLC (“AM II LLC”) are the direct and indirect general partners of BV QP, BV II and BV KG. The Reporting Person is a member of Asset 2001, AM II LLC and MPM Founders LLC.

Page 10 of 19

 

                     
CUSIP No.
  
92554J105 
  

 

           
1   NAMES OF REPORTING PERSONS:
   
  I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY): 
    Luke Evnin
     
2   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS):
  (a)   o
  (b)   þ
     
3   SEC USE ONLY:
   
   
     
4   CITIZENSHIP OR PLACE OF ORGANIZATION:
   
  Delaware
       
  5   SOLE VOTING POWER:
     
NUMBER OF   0
       
SHARES 6   SHARED VOTING POWER:
BENEFICIALLY    
OWNED BY   5,608,459(1)
       
EACH 7   SOLE DISPOSITIVE POWER:
REPORTING    
PERSON   0
       
WITH: 8   SHARED DISPOSITIVE POWER:
     
    5,608,459(1)
     
9   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON:
   
  5,608,459(1)
     
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):
   
  14.43%
     
12   TYPE OF REPORTING PERSON (SEE INSTRUCTIONS):
   
  IN
(1) The shares are held as follows: 5,012,274 by BB BioVentures, L.P. (“BB BioVentures”), 335,628 by MPM BioVentures Parallel Fund, L.P. (“MPM Parallel”), 25,283 by MPM Asset Management Investors 2000A LLC (“MPM Asset”), 130,880 by MPM BioVentures II-QP, L.P. (“BV QP”), 14,444 by MPM BioVentures II, L.P. (“BV II”), 46,089 by MPM BioVentures GmbH & Co. Parallel-Beteiligungs KG (“BV KG”), 2,715 by MPM Asset Management Investors 2001 LLC (“Asset 2001”) and 41,146 shares held by MPM Founders LLC. Also includes 433,333 shares issuable pursuant to warrants exercisable within 60 days of December 31, 2006 held by BB BioVentures. BB BioVentures is under common control with MPM Parallel and MPM Asset. BAB BioVentures L.P. (“BAB BV”), BAB BioVentures NV and MPM BioVentures I LLC (“BioVentures LLC”) are the direct and indirect general partners of BB BioVe ntures. MPM BioVentures I L.P. (“BioVentures LP”) and BioVentures LLC are the direct and indirect general partners of MPM Parallel. The Reporting person is a manager of BioVentures LLC and MPM Asset. MPM Asset Management II, L.P. (“AM II GP”) and MPM Asset Management II LLC (“AM II LLC”) are the direct and indirect general partners of BV QP, BV II and BV KG. The Reporting Person is a member of Asset 2001, AM II LLC and MPM Founders LLC.

Page 11 of 19

 

             
Item 1.
            
    (a)   Name of Issuer
        Viacell, Inc.
 
            
    (b)   Address of Issuer’s Principal Executive Offices
        245 First Street
        Cambridge, MA 02142
 
            
Item 2.
            
    (a)   Name of Person Filing
 
          BB BioVentures, LP
 
          MPM BioVentures Parallel Fund, LP
 
          MPM Asset Management Investors 2000A LLC
 
          MPM BioVentures II-QP, L.P
 
          MPM BioVentures II, L.P.
 
          MPM Asset Management Investors 2001 LLC
 
          MPM Founders LLC
 
          MPM BioVentures GmbH & Co. Parallel-Beteiligungs KG
 
          Ansbert Gadicke
 
          Luke Evnin
 
            
    (b)   Address of Principal Business Office or, if none, Residence
 
          c/o MPM Capital L.P.
 
          The John Hancock Tower
 
          200 Clarendon Street, 54th Floor
 
          Boston, MA 02116
 
            
    (c)   Citizenship
 
          All entities were organized in Delaware, except MPM BioVentures GmbH & Co Parallel-Beteiligungs KG which was organized in Germany. All individuals are United States citizens.
 
            
    (d)   Title of Class of Securities
 
          Common Stock
    (e)   CUSIP Number
 
          92554J105
 
            
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:
 
          Not applicable

Page 12 of 19

 

Item 4. Ownership
     (a) Amount Beneficially Owned:
         
BB BioVentures, LP
     5,012,274 (1)
MPM BioVentures Parallel Fund, LP
     335,628  
MPM Asset Management Investors 2000A LLC
     25,283  
MPM BioVentures II-QP, L.P
     130,880  
MPM BioVentures II, L.P.
     14,444  
MPM Asset Management Investors 2001 LLC
     2,715  
MPM BioVentures GmbH & Co. Parallel-Beteiligungs KG
     46,089  
MPM Founders LLC
     41,146  
Ansbert Gadicke
     5,628,459 (2)(3)
Luke Evnin
     5,608,459 (2)
     (b) Percent of Class:
         
BB BioVentures, LP
     12.90 %
MPM BioVentures Parallel Fund, LP
     0.87 %
MPM Asset Management Investors 2000A LLC
     0.07 %
MPM BioVentures II-QP, L.P
     0.34 %
MPM BioVentures II, L.P.
     0.04 %
MPM Asset Management Investors 2001 LLC
     0.01 %
MPM BioVentures GmbH & Co. Parallel-Beteiligungs KG
     0.12 %
MPM Founders LLC
     0.11 %
Ansbert Gadicke
     14.48 %
Luke Evnin
     14.43 %
     (c) Number of shares as to which the person has:
          (i) Sole power to vote or to direct the vote
         
BB BioVentures, LP
     5,012,274 (1)
MPM BioVentures Parallel Fund, LP
     335,628  
MPM Asset Management Investors 2000A LLC
     25,283  
MPM BioVentures II-QP, L.P
     130,880  
MPM BioVentures II, L.P.
     14,444  
MPM Asset Management Investors 2001 LLC
     2,715  
MPM BioVentures GmbH & Co. Parallel-Beteiligungs KG
     46,089  
MPM Founders LLC
     41,146  
Ansbert Gadicke
     20,000 (3)
Luke Evnin
     0  

Page 13 of 19

 

          (ii) Shared power to vote or to direct the vote
         
BB BioVentures, LP
     0  
MPM BioVentures Parallel Fund, LP
     0  
MPM Asset Management Investors 1998 LLC
     0  
MPM BioVentures II-QP, L.P
     0  
MPM BioVentures II, L.P.
     0  
MPM Asset Management Investors 2001 LLC
     0  
MPM BioVentures GmbH & Co. Parallel-Beteiligungs KG
     0  
MPM Founders LLC
     0  
Ansbert Gadicke
     5,608,459 (2)
Luke Evnin
     5,608,459 (2)
          (iii) Sole power to dispose or to direct the disposition of
         
BB BioVentures, LP
     5,012,274 (1)
MPM BioVentures Parallel Fund, LP
     335,628  
MPM Asset Management Investors 2000A LLC
     25,283  
MPM BioVentures II-QP, L.P
     130,880  
MPM BioVentures II, L.P.
     14,444  
MPM Asset Management Investors 2001 LLC
     2,715  
MPM BioVentures GmbH & Co. Parallel-Beteiligungs KG
     46,089  
MPM Founders LLC
     41,146  
Ansbert Gadicke
     20,000 (3)
Luke Evnin
     0  
          (iv) Shared power to dispose or to direct the disposition of
         
BB BioVentures, LP
     0  
MPM BioVentures Parallel Fund, LP
     0  
MPM Asset Management Investors 2000A LLC
     0  
MPM BioVentures II-QP, L.P.
     0  
MPM BioVentures II, L.P.
     0  
MPM Asset Management Investors 2001 LLC
     0  
MPM BioVentures GmbH & Co. Parallel-Beteiligungs KG
     0  
MPM Founders LLC
     0  
Ansbert Gadicke
     5,608,459 (2)
Luke Evnin
     5,608,459 (2)
 
(1)   Includes 433,333 shares issuable pursuant to warrants exercisable within 60 days of December 31, 2006.
 
(2)   The shares are held as follows: 5,012,274 by BB BioVentures, L.P. (“BB BioVentures”), 335,628 by MPM BioVentures Parallel Fund, L.P. (“MPM Parallel”), 25,283 by MPM Asset Management Investors 2000A LLC (“MPM Asset”), 130,880 by MPM BioVentures II-QP, L.P. (“BV QP”), 14,444 by MPM BioVentures II, L.P. (“BV II”), 46,089 by MPM BioVentures GmbH & Co. Parallel-Beteiligungs KG (“BV KG”), 2,715 by MPM Asset Management Investors 2001 LLC (“Asset 2001”) and 41,146 shares held by MPM Founders LLC. Also includes 433,333 shares issuable pursuant to warrants exercisable within 60 days of December 31, 2006 held by BB BioVentures. BB BioVentures is under common control with MPM Parallel and MPM Asset. BAB BioVentures L.P. (“BAB BV”), BAB BioVentures NV and MPM BioVentures I LLC (“BioVentures LLC”) are the direct and indirect general partners of BB BioVentures. MPM BioVentures I L.P. (“BioVentures LP”) and BioVentures LLC are the direct and indirect general partners of MPM Parallel. The Reporting person is a manager of BioVentures LLC and MPM Asset. MPM Asset Management II, L.P. (“AM II GP”) and MPM Asset Management II LLC (“AM II LLC”) are the direct and indirect general partners of BV QP, BV II and BV KG. The Reporting Person is a member of Asset 2001, AM II LLC and MPM Founders LLC.
 
(3)   Includes 20,000 shares issuable upon exercise of options within 60 days of December 31, 2006.

Page 14 of 19

 

Item 5. Ownership of Five Percent or Less of a Class
If this statement is being filed to report the fact that as of the date hereof the reporting person has ceased to be the beneficial owner of more than five percent of the class of securities, check the following.
Item 6.   Ownership of More than Five Percent on Behalf of Another Person
     Not Applicable
Item 7.   Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on By the Parent Holding Company or Control Person.
     Not Applicable
Item 8.   Identification and Classification of Members of the Group
     Not Applicable
Item 9.   Notice of Dissolution of a Group
     Not Applicable
Item 10.   Certification
     Not Applicable

Page 15 of 19

 

SIGNATURE
After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.
Dated: February 9, 2007
                                 
BB BIOVENTURES L.P.   MPM BIOVENTURES PARALLEL FUND, L.P.
 
                                
By:
  BAB BioVentures L.P.,       By:   MPM BioVentures I LP,                
 
  its General Partner           its General Partner                
 
                                
By:
  BAB BioVentures N.V.,       By:   MPM BioVentures I LLC,                
 
  its General Partner           its General Partner                
 
                                
By:
  /s/ Ansbert Gadicke
 
Name: Ansbert Gadicke 		      By:   /s/ Luke Evnin
 
Name: Luke B. Evnin 		               
 
  Title: Manager           Title: Manager                
 
                                
MPM ASSET MANAGEMENT INVESTORS
2000A LLC		   MPM BIOVENTURES II-QP, L.P.
 
                                
 
          By:   MPM Asset Management II, L.P.,                
By:
  /s/ Luke Evnin
 
Name: Luke B. Evnin 		          its General Partner                
 
  Title: Manager       By:   MPM Asset Management II LLC,                
 
              its General Partner                
 
                                
 
          By:   /s/ Luke Evnin
 
Name: Luke B. Evnin 		               
 
              Title: Manager                
 
                                
MPM BIOVENTURES II, L.P.   MPM ASSET MANAGEMENT INVESTORS 2001 LLC
 
                                
By:
  MPM Asset Management II, L.P.,                            
 
  its General Partner       By:   /s/ Luke Evnin
 
Name: Luke B. Evnin 		               
By:
  MPM Asset Management II LLC,           Title: Manager                
 
  its General Partner                            
 
                                
By:
  /s/ Luke Evnin
 
Name: Luke B. Evnin 		                           
 
  Title: Manager                            

Page 16 of 19

 

                                 
MPM BIOVENTURES GMBH & CO. PARALLEL-BETEILIGUNGS KG   MPM FOUNDERS LLC
 
                                
 
          By:   /s/ Luke Evnin
 
                
By: MPM Asset Management II LP, in its
capacity as the Special Limited Partner		       Name: Luke B. Evnin
Title: Manager		                
 
                                
By: MPM Asset Management II LLC, its
General Partner		                        
 
                                
By:
  /s/ Luke Evnin
 
Name: Luke B. Evnin 		                           
 
  Title: Manager                            
 
                                
By:
  /s/ Ansbert Gadicke
 
Name: Ansbert Gadicke 		      By:   /s/ Luke Evnin
 
Name: Luke B. Evnin 		               

Page 17 of 19

 

EXHIBIT A
JOINT FILING AGREEMENT
     In accordance with Rule 13d-1(k) under the Securities Exchange Act of 1934, as amended, the undersigned agree to the joint filing on behalf of each of them of a statement on Schedule 13G (including amendments thereto) with respect to the Common Stock of Viacell, Inc. and further agree that this agreement be included as an exhibit to such filing. Each party to the agreement expressly authorizes each other party to file on its behalf any and all amendments to such statement. Each party to this agreement agrees that this joint filing agreement may be signed in counterparts.
     In evidence whereof, the undersigned have caused this Agreement to be executed on their behalf this 9th day of February, 2007.
                                 
BB BIOVENTURES L.P.   MPM BIOVENTURES PARALLEL FUND, L.P.
 
                                
By:
  BAB BioVentures L.P.,       By:   MPM BioVentures I LP,                
 
  its General Partner           its General Partner                
 
                                
By:
  BAB BioVentures N.V.,       By:   MPM BioVentures I LLC,                
 
  its General Partner           its General Partner                
 
                                
By:
  /s/ Ansbert Gadicke
 
Name: Ansbert Gadicke 		      By:   /s/ Luke Evnin
 
Name: Luke B. Evnin 		               
 
  Title: Manager           Title: Manager                
 
                                
MPM ASSET MANAGEMENT INVESTORS
2000A LLC		   MPM BIOVENTURES II-QP, L.P.
 
                                
 
          By:   MPM Asset Management II, L.P.,                
By:
  /s/ Luke Evnin
 
Name: Luke B. Evnin 		          its General Partner                
 
  Title: Manager       By:   MPM Asset Management II LLC,                
 
              its General Partner                
 
                                
 
          By:   /s/ Luke Evnin
 
Name: Luke B. Evnin 		               
 
              Title: Manager                
 
                                
MPM BIOVENTURES II, L.P.   MPM ASSET MANAGEMENT INVESTORS 2001 LLC
 
                                
By:
  MPM Asset Management II, L.P.,                            
 
  its General Partner       By:   /s/ Luke Evnin
 
Name: Luke B. Evnin 		               
By:
  MPM Asset Management II LLC,           Title: Manager                
 
  its General Partner                            
 
                                
By:
  /s/ Luke Evnin
 
Name: Luke B. Evnin 		                           
 
  Title: Manager                            

Page 18 of 19

 

                                 
MPM BIOVENTURES GMBH & CO. PARALLEL-BETEILIGUNGS KG   MPM FOUNDERS LLC
 
                                
 
          By:   /s/ Luke Evnin
 
                
By: MPM Asset Management II LP, in its
capacity as the Special Limited Partner		       Name: Luke B. Evnin
Title: Manager		                
 
                                
By: MPM Asset Management II LLC, its
General Partner		                        
 
                                
By:
  /s/ Luke Evnin
 
Name: Luke B. Evnin 		                           
 
  Title: Manager                            
 
                                
By:
  /s/ Ansbert Gadicke
 
Name: Ansbert Gadicke 		      By:   /s/ Luke Evnin
 
Name: Luke B. Evnin 		               

Page 19 of 19