SECURITIES AND EXCHANGE COMMISSION
                              WASHINGTON, DC 20549

                                  SCHEDULE 13G
                                 (Rule 13d-102)


  INFORMATION TO BE INCLUDED IN STATEMENTS FILED PURSUANT TO RULES 13d-1(b)(c),
         AND (d) AND AMENDMENTS THERETO FILED PURSUANT TO RULE 13d-2(b)

                              (AMENDMENT NO. 3)*


                         Alnylam Pharmaceuticals, Inc.
--------------------------------------------------------------------------------
                                (Name of Issuer)


                    Common Stock, $0.01 par value per share
--------------------------------------------------------------------------------
                         (Title of Class of Securities)


                                   02043Q107
                           --------------------------
                                 (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:

          [_]  Rule 13d-1(b)
          [X]  Rule 13d-1(c)
          [_]  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).




________________________________________________________________________________
1.   NAME OF REPORTING PERSONS
     I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS (ENTITIES ONLY)


     Abingworth Management Limited
________________________________________________________________________________
2.   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                 (a)  [_]
                                                                 (b)  [_]

________________________________________________________________________________
3.   SEC USE ONLY



________________________________________________________________________________
4.   CITIZENSHIP OR PLACE OF ORGANIZATION


     ENGLAND
________________________________________________________________________________
  NUMBER OF    5.   SOLE VOTING POWER

   SHARES           0
               _________________________________________________________________
BENEFICIALLY   6.   SHARED VOTING POWER

  OWNED BY          2,040,000
               _________________________________________________________________
    EACH       7.   SOLE DISPOSITIVE POWER

  REPORTING         0
               _________________________________________________________________
   PERSON      8.   SHARED DISPOSITIVE POWER

    WITH            2,040,000
________________________________________________________________________________
9.   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

     2,040,000 shares

________________________________________________________________________________
10.  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*

                                                                          [_]

________________________________________________________________________________
11.  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9


     6.3%
________________________________________________________________________________
12.  TYPE OF REPORTING PERSON*


     CO
________________________________________________________________________________




________________________________________________________________________________
1.   NAME OF REPORTING PERSONS
     I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS (ENTITIES ONLY)


     Abingworth Bioventures III A L.P.
________________________________________________________________________________
2.   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                 (a)  [_]
                                                                 (b)  [_]

________________________________________________________________________________
3.   SEC USE ONLY



________________________________________________________________________________
4.   CITIZENSHIP OR PLACE OF ORGANIZATION


     ENGLAND
________________________________________________________________________________
  NUMBER OF    5.   SOLE VOTING POWER

   SHARES           0
               _________________________________________________________________
BENEFICIALLY   6.   SHARED VOTING POWER

  OWNED BY          1,850,000
               _________________________________________________________________
    EACH       7.   SOLE DISPOSITIVE POWER

  REPORTING         0
               _________________________________________________________________
   PERSON      8.   SHARED DISPOSITIVE POWER

    WITH            1,850,000
________________________________________________________________________________
9.   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

     1,850,000 shares

________________________________________________________________________________
10.  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*

                                                                          [_]

________________________________________________________________________________
11.  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9


     5.8%
________________________________________________________________________________
12.  TYPE OF REPORTING PERSON*


     PN
________________________________________________________________________________




________________________________________________________________________________
1.   NAME OF REPORTING PERSONS
     I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS (ENTITIES ONLY)


     Abingworth Bioventures III B L.P.
________________________________________________________________________________
2.   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                 (a)  [_]
                                                                 (b)  [_]

________________________________________________________________________________
3.   SEC USE ONLY



________________________________________________________________________________
4.   CITIZENSHIP OR PLACE OF ORGANIZATION


     ENGLAND
________________________________________________________________________________
  NUMBER OF    5.   SOLE VOTING POWER

   SHARES           0
               _________________________________________________________________
BENEFICIALLY   6.   SHARED VOTING POWER

  OWNED BY          1,850,000 shares
               _________________________________________________________________
    EACH       7.   SOLE DISPOSITIVE POWER

  REPORTING         0
               _________________________________________________________________
   PERSON      8.   SHARED DISPOSITIVE POWER

    WITH            1,850,000 shares
________________________________________________________________________________
9.   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

     1,850,000 shares

________________________________________________________________________________
10.  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*

                                                                          [_]

________________________________________________________________________________
11.  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9


     5.8%
________________________________________________________________________________
12.  TYPE OF REPORTING PERSON*


     PN
________________________________________________________________________________




________________________________________________________________________________
1.   NAME OF REPORTING PERSONS
     I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS (ENTITIES ONLY)


     Abingworth Bioventures III C L.P.
________________________________________________________________________________
2.   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                 (a)  [_]
                                                                 (b)  [_]

________________________________________________________________________________
3.   SEC USE ONLY



________________________________________________________________________________
4.   CITIZENSHIP OR PLACE OF ORGANIZATION


     ENGLAND
________________________________________________________________________________
  NUMBER OF    5.   SOLE VOTING POWER

   SHARES           0
               _________________________________________________________________
BENEFICIALLY   6.   SHARED VOTING POWER

  OWNED BY          1,850,000 shares
               _________________________________________________________________
    EACH       7.   SOLE DISPOSITIVE POWER

  REPORTING         0
               _________________________________________________________________
   PERSON      8.   SHARED DISPOSITIVE POWER

    WITH            1,850,000 shares
________________________________________________________________________________
9.   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

     1,850,000 shares

________________________________________________________________________________
10.  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*

                                                                          [_]

________________________________________________________________________________
11.  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9


     5.8%
________________________________________________________________________________
12.  TYPE OF REPORTING PERSON*


     PN
________________________________________________________________________________




________________________________________________________________________________
1.   NAME OF REPORTING PERSONS
     I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS (ENTITIES ONLY)


     Abingworth Bioventures III Executives L.P.
________________________________________________________________________________
2.   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                 (a)  [_]
                                                                 (b)  [_]

________________________________________________________________________________
3.   SEC USE ONLY



________________________________________________________________________________
4.   CITIZENSHIP OR PLACE OF ORGANIZATION


     ENGLAND
________________________________________________________________________________
  NUMBER OF    5.   SOLE VOTING POWER

   SHARES           0
               _________________________________________________________________
BENEFICIALLY   6.   SHARED VOTING POWER

  OWNED BY          1,850,000 shares
               _________________________________________________________________
    EACH       7.   SOLE DISPOSITIVE POWER

  REPORTING         0
               _________________________________________________________________
   PERSON      8.   SHARED DISPOSITIVE POWER

    WITH            1,850,000 shares
________________________________________________________________________________
9.   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

     2,000,000 shares

________________________________________________________________________________
10.  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*

                                                                          [_]

________________________________________________________________________________
11.  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9


     5.8%
________________________________________________________________________________
12.  TYPE OF REPORTING PERSON*


     PN
________________________________________________________________________________




ITEM 1(a).  NAME OF ISSUER: Alnylam Pharmaceuticals, Inc. (the "Issuer")

ITEM 1(b).  ADDRESS OF ISSUER'S PRINCIPAL EXECUTIVE OFFICES:

            300 Third Street, Cambridge, Massachusetts 02142

ITEM 2(a).  NAME OF PERSONS FILING: Abingworth Management Limited ("Abingworth
            Management"), Abingworth Bioventures III A L.P. ("ABV III A"),
            Abingworth Bioventures III B L.P. ("ABV III B"), Abingworth
            Bioventures III C L.P. ("ABV III C"), and Abingworth Bioventures III
            Executives L.P. ("ABV III Executives" and together with ABV III A,
            ABV III B and ABV III C, the "Funds"). The foregoing individuals are
            collectively referred to as the "Reporting Persons."

ITEM 2(b).  ADDRESS OF PRINCIPAL BUSINESS OFFICE OR, IF NONE, RESIDENCE: The
            business address for Abingworth Management, ABV III A, ABV III B,
            ABV III C and ABV III Executives is c/o Abingworth Management
            Limited, Princess House, 38 Jermyn Street, London, England SW1Y 6DN.

ITEM 2(c).  CITIZENSHIP: Abingworth Management is a corporation organized under
            the laws of England. ABV III A, ABV III B and ABV III C are limited
            partnerships organized under the laws of England. ABV III Executives
            is a limited partnership organized under the laws of Delaware.

ITEM 2(d).  TITLE OF CLASS OF SECURITIES: Common Stock, $0.01 par value
            per share

ITEM 2(e).  CUSIP NUMBER: 02043Q107

ITEM 3.     IF THIS STATEMENT IS FILED PURSUANT TO RULE 13D-1(B), OR
            13D-2(B) OR (C), CHECK WHETHER THE PERSON FILING IS A:

            Not applicable.

ITEM 4.     OWNERSHIP.

            (a)   Amount Beneficially Owned: ABV III A is the record owner of
                  932,962 shares of Common Stock (the "ABV III A Shares") as of
                  December 31, 2006. ABV III B is the record owner of 566,908
                  shares of Common Stock (the "ABV III B Shares") as of December
                  31, 2006. ABV III C is the record owner of 339,593 shares of
                  Common Stock (the "ABV III C Shares") as of December 31, 2006.
                  ABV III Executives is the record owner of 14,799 shares of
                  Common Stock ("ABV III Executives" and together with ABV III
                  A, ABV III B and ABV III C the "ABV III Funds") as of December
                  31, 2006. Collectively, the ABV III funds beneficially own
                  1,850,000 shares of common stock.

                  The ABV III Funds share a manager, Abingworth Management, and
                  are affiliated funds, and, on this basis, may be deemed to
                  beneficially own the shares held by one another. Each of the
                  ABV III Funds disclaims beneficial ownership of such shares of
                  Common Stock except for the shares, if any, such ABV III Fund
                  holds of record. Abingworth Management may be deemed to
                  beneficially own the shares of Common Stock held of record by
                  ABV III A, ABV III B, ABV III C, ABV III Executives and
                  Abingworth Bioequities Master Fund Limited ("ABE"),
                  representing an aggregate of 2,040,000 shares of Common Stock.





            (b)   Percent of Class: The ABV III Funds, collectively,
                  beneficially own 5.8% of the outstanding Common Stock of the
                  Issuer. Abingworth Management may be deemed to beneficially
                  own the shares of Common Stock held of record by ABV III A,
                  ABV III B, ABV III C, ABV III Executives and ABE, representing
                  an aggregate of 6.3% of the outstanding Common Stock of the
                  Issuer.

                  The foregoing percentages are calculated based on the
                  32,176,921 shares of Common Stock reported to be outstanding
                  as of September 30, 2006 in the Issuer's Form 10-Q filed with
                  the Securities Exchange Commission on November 9, 2006.

            (c)   Number of shares as to which such person has:

                     (i) sole power to vote or to direct the vote: see line 5 of
                     cover sheets.

                     (ii) shared power to vote or to direct the vote: see line 6
                     of cover sheets.

                     (iii) sole power to dispose or to direct the disposition:
                     see line 7 of cover sheets.

                     (iv) shared power to dispose or to direct the disposition:
                     see line 8 of cover sheets.

            Each Reporting Person disclaims beneficial ownership of such shares
            of Common Stock except for the shares, if any, such Reporting Person
            holds of record.

ITEM 5.     OWNERSHIP OF FIVE PERCENT OR LESS OF A CLASS.

            Not applicable.

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.

            Not applicable.

ITEM 8.     IDENTIFICATION AND CLASSIFICATION OF MEMBERS OF THE GROUP.

            Not applicable.

ITEM 9.     NOTICE OF DISSOLUTION OF GROUP.

            Not applicable.

ITEM 10.    CERTIFICATION.

            By signing below I certify that, to the best of my knowledge and
            belief, the securities referred to above were not acquired and are
            not held for the purpose of or with the effect of changing or
            influencing the control of the issuer of the securities and were not
            acquired and are not held in connection with or as a participant in
            any transaction having that purpose or effect.





                                    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.

Date:  February 12, 2007


ABINGWORTH MANAGEMENT LIMITED

By:     /s/ DAVID LEATHERS
        -----------------------------
        Name:    David Leathers
        Title:   Executive Director


ABINGWORTH BIOVENTURES III A L.P.

By:     Abingworth Management Limited, its Manager

By:     /s/ DAVID LEATHERS
        -----------------------------
        Name:    David Leathers
        Title:   Executive Director


ABINGWORTH BIOVENTURES III B L.P.

By:     Abingworth Management Limited, its Manager

By:     /s/ DAVID LEATHERS
        -----------------------------
        Name:    David Leathers
        Title:   Executive Director


ABINGWORTH BIOVENTURES III C L.P.

By:     Abingworth Management Limited, its Manager

By:     /s/ DAVID LEATHERS
        -----------------------------
        Name:    David Leathers
        Title:   Executive Director

ABINGWORTH BIOVENTURES III EXECUTIVES L.P.

By:     Abingworth Management Limited, its Manager

By:     /s/ DAVID LEATHERS
        -----------------------------
        Name:    David Leathers
        Title:   Executive Director





                                                               EXHIBIT 1

                                    AGREEMENT

      Pursuant to Rule 13d-1(k)(1) under the Securities Exchange Act of 1934,
the undersigned hereby agree that only one statement containing the information
required by Schedule 13G need be filed with respect to the ownership by each of
the undersigned of shares of Common Stock of Alnylam Pharmaceuticals, Inc.

      EXECUTED as a sealed instrument this 12th day of February, 2007.

ABINGWORTH MANAGEMENT LIMITED

By:     /s/ DAVID LEATHERS
        -----------------------------
        Name:    David Leathers
        Title:   Executive Director


ABINGWORTH BIOVENTURES III A L.P.

By:     Abingworth Management Limited, its Manager

By:     /s/ DAVID LEATHERS
        -----------------------------
        Name:    David Leathers
        Title:   Executive Director


ABINGWORTH BIOVENTURES III B L.P.

By:     Abingworth Management Limited, its Manager

By:     /s/ DAVID LEATHERS
        -----------------------------
        Name:    David Leathers
        Title:   Executive Director


ABINGWORTH BIOVENTURES III C L.P.

By:     Abingworth Management Limited, its Manager

By:     /s/ DAVID LEATHERS
        -----------------------------
        Name:    David Leathers
        Title:   Executive Director

ABINGWORTH BIOVENTURES III EXECUTIVES L.P.

By:     Abingworth Management Limited, its Manager

By:     /s/ DAVID LEATHERS
        -----------------------------
        Name:    David Leathers
        Title:   Executive Director