SC 13D/A 1 sc13da506588004_07062007.htm sec document 

                       SECURITIES AND EXCHANGE COMMISSION
                              WASHINGTON, DC 20549
                                 --------------
                                  SCHEDULE 13D
                                 (RULE 13d-101)
             INFORMATION TO BE INCLUDED IN STATEMENTS FILED PURSUANT
            TO RULE 13d-1(a) AND AMENDMENTS THERETO FILED PURSUANT TO
                                  RULE 13d-2(a)

                              (Amendment No. 5)(1)


                             Rural/Metro Corporation
                             -----------------------
                                (Name of Issuer)


                          Common Stock, $0.01 Par Value
                          -----------------------------
                         (Title of Class of Securities)


                                    781748108
                                    ---------
                                 (CUSIP Number)

                              STEVEN WOLOSKY, ESQ.
                 OLSHAN GRUNDMAN FROME ROSENZWEIG & WOLOSKY LLP
                                Park Avenue Tower
                               65 East 55th Street
                            New York, New York 10022
                                 (212) 451-2300
                                 --------------
                  (Name, Address and Telephone Number of Person
                Authorized to Receive Notices and Communications)

                                  July 6, 2007
                                  ------------
             (Date of Event Which Requires Filing of This Statement)


      If the filing person has  previously  filed a statement on Schedule 13G to
report the  acquisition  that is the subject of this Schedule 13D, and is filing
this  schedule  because  of Rule  13d-1(e),  13d-1(f)  or  13d-1(g),  check  the
following box /X/.

      NOTE.  Schedules filed in paper format shall include a signed original and
five copies of the schedule,  including  all exhibits.  SEE Rule 13d-7 for other
parties to whom copies are to be sent.

                         (Continued on following pages)
                              (Page 1 of 15 Pages)


--------
(1)   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 disclosures provided in a prior cover page.

      The information  required on 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 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. 781748108                   13D                    Page 2 of 15 Pages
----------------------                                    ----------------------


================================================================================
     1         NAME OF REPORTING PERSONS
               I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

                    ACCIPITER LIFE SCIENCES FUND, LP
--------------------------------------------------------------------------------
     2         CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*         (a) /X/
                                                                         (b) / /
--------------------------------------------------------------------------------
     3         SEC USE ONLY

--------------------------------------------------------------------------------
     4         SOURCE OF FUNDS*

                    WC
--------------------------------------------------------------------------------
     5         CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED
               PURSUANT TO ITEM 2(d) OR 2(e)                                 / /
--------------------------------------------------------------------------------
     6         CITIZENSHIP OR PLACE OF ORGANIZATION

                    DELAWARE
--------------------------------------------------------------------------------
 NUMBER OF         7     SOLE VOTING POWER
   SHARES
BENEFICIALLY                  664,120
  OWNED BY     -----------------------------------------------------------------
    EACH           8     SHARED VOTING POWER
 REPORTING
PERSON WITH                   - 0 -
               -----------------------------------------------------------------
                   9     SOLE DISPOSITIVE POWER

                              664,120
               -----------------------------------------------------------------
                  10     SHARED DISPOSITIVE POWER

                              - 0 -
--------------------------------------------------------------------------------
    11         AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING
               PERSON

                    664,120
--------------------------------------------------------------------------------
    12         CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES
               CERTAIN SHARES*                                               / /
--------------------------------------------------------------------------------
    13         PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

                    2.7%
--------------------------------------------------------------------------------
    14         TYPE OF REPORTING PERSON*

                    PN
================================================================================

                      *SEE INSTRUCTIONS BEFORE FILLING OUT!



----------------------                                    ----------------------
CUSIP No. 781748108                   13D                    Page 3 of 15 Pages
----------------------                                    ----------------------


================================================================================
     1         NAME OF REPORTING PERSONS
               I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

                    ACCIPITER LIFE SCIENCES FUND (OFFSHORE), LTD.
--------------------------------------------------------------------------------
     2         CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*         (a) /X/
                                                                         (b) / /
--------------------------------------------------------------------------------
     3         SEC USE ONLY

--------------------------------------------------------------------------------
     4         SOURCE OF FUNDS*

                    WC
--------------------------------------------------------------------------------
     5         CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED
               PURSUANT TO ITEM 2(d) OR 2(e)                                 / /
--------------------------------------------------------------------------------
     6         CITIZENSHIP OR PLACE OF ORGANIZATION

                    CAYMAN ISLANDS
--------------------------------------------------------------------------------
 NUMBER OF         7     SOLE VOTING POWER
   SHARES
BENEFICIALLY                  668,232
  OWNED BY     -----------------------------------------------------------------
    EACH           8     SHARED VOTING POWER
 REPORTING
PERSON WITH                   - 0 -
               -----------------------------------------------------------------
                   9     SOLE DISPOSITIVE POWER

                              668,232
               -----------------------------------------------------------------
                  10     SHARED DISPOSITIVE POWER

                              - 0 -
--------------------------------------------------------------------------------
    11         AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING
               PERSON

                    668,232
--------------------------------------------------------------------------------
    12         CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES
               CERTAIN SHARES*                                               / /
--------------------------------------------------------------------------------
    13         PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

                    2.7%
--------------------------------------------------------------------------------
    14         TYPE OF REPORTING PERSON*

                    CO
================================================================================

                      *SEE INSTRUCTIONS BEFORE FILLING OUT!



----------------------                                    ----------------------
CUSIP No. 781748108                   13D                    Page 4 of 15 Pages
----------------------                                    ----------------------


================================================================================
     1         NAME OF REPORTING PERSONS
               I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

                    ACCIPITER LIFE SCIENCES FUND II, LP
--------------------------------------------------------------------------------
     2         CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*         (a) /X/
                                                                         (b) / /
--------------------------------------------------------------------------------
     3         SEC USE ONLY

--------------------------------------------------------------------------------
     4         SOURCE OF FUNDS*

                    WC
--------------------------------------------------------------------------------
     5         CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED
               PURSUANT TO ITEM 2(d) OR 2(e)                                 / /
--------------------------------------------------------------------------------
     6         CITIZENSHIP OR PLACE OF ORGANIZATION

                    DELAWARE
--------------------------------------------------------------------------------
 NUMBER OF         7     SOLE VOTING POWER
   SHARES
BENEFICIALLY                  515,250
  OWNED BY     -----------------------------------------------------------------
    EACH           8     SHARED VOTING POWER
 REPORTING
PERSON WITH                   - 0 -
               -----------------------------------------------------------------
                   9     SOLE DISPOSITIVE POWER

                              515,250
               -----------------------------------------------------------------
                  10     SHARED DISPOSITIVE POWER

                              - 0 -
--------------------------------------------------------------------------------
    11         AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING
               PERSON

                    515,250
--------------------------------------------------------------------------------
    12         CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES
               CERTAIN SHARES*                                               / /
--------------------------------------------------------------------------------
    13         PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

                    2.1%
--------------------------------------------------------------------------------
    14         TYPE OF REPORTING PERSON*

                    PN
================================================================================

                      *SEE INSTRUCTIONS BEFORE FILLING OUT!



----------------------                                    ----------------------
CUSIP No. 781748108                   13D                    Page 5 of 15 Pages
----------------------                                    ----------------------


================================================================================
     1         NAME OF REPORTING PERSONS
               I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

                    ACCIPITER LIFE SCIENCES FUND II (OFFSHORE), LTD.
--------------------------------------------------------------------------------
     2         CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*         (a) /X/
                                                                         (b) / /
--------------------------------------------------------------------------------
     3         SEC USE ONLY

--------------------------------------------------------------------------------
     4         SOURCE OF FUNDS*

                    WC
--------------------------------------------------------------------------------
     5         CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED
               PURSUANT TO ITEM 2(d) OR 2(e)                                 / /
--------------------------------------------------------------------------------
     6         CITIZENSHIP OR PLACE OF ORGANIZATION

                    CAYMAN ISLAND
--------------------------------------------------------------------------------
 NUMBER OF         7     SOLE VOTING POWER
   SHARES
BENEFICIALLY                  1,020,124
  OWNED BY     -----------------------------------------------------------------
    EACH           8     SHARED VOTING POWER
 REPORTING
PERSON WITH                   - 0 -
               -----------------------------------------------------------------
                   9     SOLE DISPOSITIVE POWER

                              1,020,124
               -----------------------------------------------------------------
                  10     SHARED DISPOSITIVE POWER

                              - 0 -
--------------------------------------------------------------------------------
    11         AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING
               PERSON

                    1,020,124
--------------------------------------------------------------------------------
    12         CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES
               CERTAIN SHARES*                                               / /
--------------------------------------------------------------------------------
    13         PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

                    4.1%
--------------------------------------------------------------------------------
    14         TYPE OF REPORTING PERSON*

                    CO
================================================================================

                      *SEE INSTRUCTIONS BEFORE FILLING OUT!



----------------------                                    ----------------------
CUSIP No. 781748108                   13D                    Page 6 of 15 Pages
----------------------                                    ----------------------


================================================================================
     1         NAME OF REPORTING PERSONS
               I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

                    ACCIPITER LIFE SCIENCES FUND II (QP), LP
--------------------------------------------------------------------------------
     2         CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*         (a) /X/
                                                                         (b) / /
--------------------------------------------------------------------------------
     3         SEC USE ONLY

--------------------------------------------------------------------------------
     4         SOURCE OF FUNDS*

                    WC
--------------------------------------------------------------------------------
     5         CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED
               PURSUANT TO ITEM 2(d) OR 2(e)                                 / /
--------------------------------------------------------------------------------
     6         CITIZENSHIP OR PLACE OF ORGANIZATION

                    DELAWARE
--------------------------------------------------------------------------------
 NUMBER OF         7     SOLE VOTING POWER
   SHARES
BENEFICIALLY                  589,183
  OWNED BY     -----------------------------------------------------------------
    EACH           8     SHARED VOTING POWER
 REPORTING
PERSON WITH                   - 0 -
               -----------------------------------------------------------------
                   9     SOLE DISPOSITIVE POWER

                              589,183
               -----------------------------------------------------------------
                  10     SHARED DISPOSITIVE POWER

                              - 0 -
--------------------------------------------------------------------------------
    11         AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING
               PERSON

                    589,183
--------------------------------------------------------------------------------
    12         CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES
               CERTAIN SHARES*                                               / /
--------------------------------------------------------------------------------
    13         PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

                    2.4%
--------------------------------------------------------------------------------
    14         TYPE OF REPORTING PERSON*

                    PN
================================================================================

                      *SEE INSTRUCTIONS BEFORE FILLING OUT!



----------------------                                    ----------------------
CUSIP No. 781748108                   13D                    Page 7 of 15 Pages
----------------------                                    ----------------------


================================================================================
     1         NAME OF REPORTING PERSONS
               I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

                    CANDENS CAPITAL, LLC
--------------------------------------------------------------------------------
     2         CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*         (a) /X/
                                                                         (b) / /
--------------------------------------------------------------------------------
     3         SEC USE ONLY

--------------------------------------------------------------------------------
     4         SOURCE OF FUNDS*

                    AF
--------------------------------------------------------------------------------
     5         CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED
               PURSUANT TO ITEM 2(d) OR 2(e)                                 / /
--------------------------------------------------------------------------------
     6         CITIZENSHIP OR PLACE OF ORGANIZATION

                    DELAWARE
--------------------------------------------------------------------------------
 NUMBER OF         7     SOLE VOTING POWER
   SHARES
BENEFICIALLY                  1,768,553
  OWNED BY     -----------------------------------------------------------------
    EACH           8     SHARED VOTING POWER
 REPORTING
PERSON WITH                   - 0 -
               -----------------------------------------------------------------
                   9     SOLE DISPOSITIVE POWER

                              1,768,553
               -----------------------------------------------------------------
                  10     SHARED DISPOSITIVE POWER

                              - 0 -
--------------------------------------------------------------------------------
    11         AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING
               PERSON

                    1,768,553
--------------------------------------------------------------------------------
    12         CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES
               CERTAIN SHARES*                                               / /
--------------------------------------------------------------------------------
    13         PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

                    7.2%
--------------------------------------------------------------------------------
    14         TYPE OF REPORTING PERSON*

                    OO
================================================================================

                      *SEE INSTRUCTIONS BEFORE FILLING OUT!



----------------------                                    ----------------------
CUSIP No. 781748108                   13D                    Page 8 of 15 Pages
----------------------                                    ----------------------


================================================================================
     1         NAME OF REPORTING PERSONS
               I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

                    ACCIPITER CAPITAL MANAGEMENT, LLC
--------------------------------------------------------------------------------
     2         CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*         (a) /X/
                                                                         (b) / /
--------------------------------------------------------------------------------
     3         SEC USE ONLY

--------------------------------------------------------------------------------
     4         SOURCE OF FUNDS*

                    AF
--------------------------------------------------------------------------------
     5         CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED
               PURSUANT TO ITEM 2(d) OR 2(e)                                 / /
--------------------------------------------------------------------------------
     6         CITIZENSHIP OR PLACE OF ORGANIZATION

                    DELAWARE
--------------------------------------------------------------------------------
 NUMBER OF         7     SOLE VOTING POWER
   SHARES
BENEFICIALLY                  1,688,356
  OWNED BY     -----------------------------------------------------------------
    EACH           8     SHARED VOTING POWER
 REPORTING
PERSON WITH                   - 0 -
               -----------------------------------------------------------------
                   9     SOLE DISPOSITIVE POWER

                              1,688,356
               -----------------------------------------------------------------
                  10     SHARED DISPOSITIVE POWER

                              - 0 -
--------------------------------------------------------------------------------
    11         AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING
               PERSON

                    1,688,356
--------------------------------------------------------------------------------
    12         CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES
               CERTAIN SHARES*                                               / /
--------------------------------------------------------------------------------
    13         PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

                    6.8%
--------------------------------------------------------------------------------
    14         TYPE OF REPORTING PERSON*

                    OO
================================================================================

                      *SEE INSTRUCTIONS BEFORE FILLING OUT!



----------------------                                    ----------------------
CUSIP No. 781748108                   13D                    Page 9 of 15 Pages
----------------------                                    ----------------------


================================================================================
     1         NAME OF REPORTING PERSONS
               I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

                    GABE HOFFMAN
--------------------------------------------------------------------------------
     2         CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*         (a) /X/
                                                                         (b) / /
--------------------------------------------------------------------------------
     3         SEC USE ONLY

--------------------------------------------------------------------------------
     4         SOURCE OF FUNDS*

                    AF
--------------------------------------------------------------------------------
     5         CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED
               PURSUANT TO ITEM 2(d) OR 2(e)                                 / /
--------------------------------------------------------------------------------
     6         CITIZENSHIP OR PLACE OF ORGANIZATION

                    USA
--------------------------------------------------------------------------------
 NUMBER OF         7     SOLE VOTING POWER
   SHARES
BENEFICIALLY                  3,456,909
  OWNED BY     -----------------------------------------------------------------
    EACH           8     SHARED VOTING POWER
 REPORTING
PERSON WITH                   - 0 -
               -----------------------------------------------------------------
                   9     SOLE DISPOSITIVE POWER

                              3,456,909
               -----------------------------------------------------------------
                  10     SHARED DISPOSITIVE POWER

                              - 0 -
--------------------------------------------------------------------------------
    11         AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING
               PERSON

                    3,456,909
--------------------------------------------------------------------------------
    12         CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES
               CERTAIN SHARES*                                               / /
--------------------------------------------------------------------------------
    13         PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

                    14.801%
--------------------------------------------------------------------------------
    14         TYPE OF REPORTING PERSON*

                    IN
================================================================================

                      *SEE INSTRUCTIONS BEFORE FILLING OUT!



----------------------                                    ----------------------
CUSIP No. 781748108                   13D                    Page 10 of 15 Pages
----------------------                                    ----------------------

      The following  constitutes  Amendment  No. 5 ("Amendment  No. 5") to the
Schedule  13D  filed by the  undersigned.  This  Amendment  No. 5  amends  the
Schedule 13D as specifically set forth.

      Item 3 is hereby amended and restated to read as follows:

Item 3.     SOURCE AND AMOUNT OF FUNDS OR OTHER CONSIDERATION.

            The aggregate purchase price of the 664,120 Shares owned by ALS Fund
is $4,857,161,  including  brokerage  commissions.  The Shares owned by ALS Fund
were acquired with partnership funds.

            The aggregate purchase price of the 515,250 Shares owned by ALS Fund
II is $3,926,263,  including brokerage commissions. The Shares owned by ALS Fund
II were acquired with partnership funds.

            The aggregate purchase price of the 589,183 Shares owned by ALS Fund
II QP is $4,450,444,  including brokerage  commissions.  The Shares owned by ALS
Fund II QP were acquired with partnership funds.

            The aggregate purchase price of the 668,232 Shares owned by ALS Fund
Offshore is $4,865,635, including brokerage commissions. The Shares owned by ALS
Fund Offshore were acquired using its working capital.

            The aggregate  purchase  price of the 1,020,124  Shares owned by ALS
Fund II Offshore is  $7,652,782,  including  brokerage  commissions.  The Shares
owned by ALS Fund II Offshore were acquired using its working capital.

      Item 5(a) is hereby amended and restated to read as follows:

            (a) The aggregate percentage of Shares reported owned by each person
named herein is based upon  24,679,103  Shares  outstanding,  which is the total
number  of Shares  outstanding  as of May 7, 2007 as  reported  in the  Issuer's
Quarterly  Report  on Form  10-Q as  filed  with  the  Securities  and  Exchange
Commission on May 10, 2007.

      As of the close of business on July 6, 2007, ALS Fund, ALS Fund II and ALS
Fund II QP beneficially owned 664,120 Shares, 515,250 Shares and 589,183 Shares,
respectively,  constituting  approximately  2.7%,  2.1% and  2.4% of the  Shares
outstanding,  respectively. As the general partner of each of ALS Fund, ALS Fund
II and ALS Fund II QP,  Candens  Capital may be deemed to  beneficially  own the
1,768,553 Shares collectively owned by ALS Fund, ALS Fund II and ALS Fund II QP,
constituting approximately 7.2% of the Shares outstanding.

      As of the close of business  on July 6, 2007,  ALS Fund  Offshore  and ALS
Fund II  Offshore  beneficially  owned  668,232  Shares  and  1,020,124  Shares,
respectively,   constituting   approximately   2.7%  and  4.1%  of  the   Shares
outstanding,  respectively.  As the  investment  manager  of  each  of ALS  Fund
Offshore  and ALS  Fund II  Offshore,  Accipiter  Management  may be  deemed  to
beneficially  own the 1,688,356 Shares  collectively  owned by ALS Fund Offshore
and  ALS  Fund  II  Offshore,  constituting  approximately  6.8%  of the  Shares
outstanding.



----------------------                                    ----------------------
CUSIP No. 781748108                   13D                    Page 11 of 15 Pages
----------------------                                    ----------------------


      As the  managing  member  of  each of  Accipiter  Management  and  Candens
Capital,  Mr.  Hoffman  may be  deemed  to  beneficially  own  3,456,909  Shares
collectively owned by the Accipiter Entities,  constituting approximately 14.01%
of the Shares  outstanding.  Mr. Hoffman has sole voting and  dispositive  power
with respect to the 3,456,909  Shares owned by the Accipiter  Entities by virtue
of his authority to vote and dispose of such Shares.

      Item 5(c) is hereby amended to add the following:

(c) Schedule A annexed hereto lists all transactions by the Reporting Persons in
the Shares since the filing of Amendment  No. 4 to the Schedule 13D. All of such
transactions were effected in the open market.



----------------------                                    ----------------------
CUSIP No. 781748108                   13D                    Page 12 of 15 Pages
----------------------                                    ----------------------

                                  SIGNATURES
            After  reasonable  inquiry  and to the  best  of his  knowledge  and
belief, each of the undersigned certifies that the information set forth in this
statement is true, complete and correct.

Dated: July 9, 2007                      ACCIPITER LIFE SCIENCES FUND, LP
                                         By: Candens Capital, LLC
                                             its general partner

                                         By: /s/ Gabe Hoffman
                                             ----------------------------------
                                             Gabe Hoffman, Managing Member


                                         ACCIPITER LIFE SCIENCES FUND II, LP

                                         By: Candens Capital, LLC
                                             its general partner

                                         By: /s/ Gabe Hoffman
                                             ----------------------------------
                                             Gabe Hoffman, Managing Member


                                         ACCIPITER LIFE SCIENCES FUND II (QP),
                                         LP

                                         By: Candens Capital, LLC
                                             its general partner

                                         By: /s/ Gabe Hoffman
                                             ----------------------------------
                                             Gabe Hoffman, Managing Member


                                         ACCIPITER LIFE SCIENCES FUND
                                         (OFFSHORE), LTD.

                                         By: Accipiter Capital Management, LLC
                                             its investment manager

                                         By: /s/ Gabe Hoffman
                                             ----------------------------------
                                             Gabe Hoffman, Managing Member


                                         ACCIPITER LIFE SCIENCES FUND II
                                         (OFFSHORE), LTD.

                                         By: Accipiter Capital Management, LLC
                                             its investment manager

                                         By: /s/ Gabe Hoffman
                                             ----------------------------------
                                             Gabe Hoffman, Managing Member




----------------------                                    ----------------------
CUSIP No. 781748108                   13D                    Page 13 of 15 Pages
----------------------                                    ----------------------


                                         ACCIPITER CAPITAL MANAGEMENT, LLC

                                         By: /s/ Gabe Hoffman
                                             ----------------------------------
                                             Gabe Hoffman, Managing Member


                                         CANDENS CAPITAL, LLC

                                         By: /s/ Gabe Hoffman
                                             ----------------------------------
                                             Gabe Hoffman, Managing Member


                                         /s/ Gabe Hoffman
                                         ---------------------------------------
                                         GABE HOFFMAN



----------------------                                    ----------------------
CUSIP No. 781748108                   13D                    Page 14 of 15 Pages
----------------------                                    ----------------------

                                   SCHEDULE A

                      TRANSACTIONS IN SHARES OF THE ISSUER
             SINCE THE FILING OF AMENDMENT NO. 4 TO THE SCHEDULE 13D


               ALL TRANSACTIONS WERE EFFECTED IN THE OPEN MARKET.



          Class             Quantity         Price Per        Date of
       of Security          Purchased        Unit ($)         Purchase
       -----------          ---------        --------         --------


      I. ACCIPITER LIFE SCIENCES FUND, LP

      Common Stock                  4,981        5.6100         07/05/07
      Common Stock                  6,830        5.5294         07/05/07
      Common Stock                  5,736        5.6400         07/06/07
      Common Stock                 38,240        5.5400         07/06/07

      II. AFFILIATES OF ACCIPITER LIFE SCIENCES FUND, LP


      ACCIPITER LIFE SCIENCES FUND II, LP
      Common Stock                  6,181        5.6400         07/06/07
      Common Stock                 41,206        5.5400         07/06/07


      ACCIPITER LIFE SCIENCES FUND (OFFSHORE), LTD.
      Common Stock                  5,019        5.6100         07/05/07
      Common Stock                  6,881        5.5294         07/05/07
      Common Stock                  5,885        5.6400         07/06/07
      Common Stock                 39,234        5.5400         07/06/07


      ACCIPITER LIFE SCIENCES FUND II (OFFSHORE), LTD.
      Common Stock                 7,992         5.6400         07/06/07
      Common Stock                53,279         5.5400         07/06/07


      ACCIPITER LIFE SCIENCES FUND II (QP), LP
      Common Stock                 4,206         5.6400         07/06/07



----------------------                                    ----------------------
CUSIP No. 781748108                   13D                    Page 15 of 15 Pages
----------------------                                    ----------------------


          Class             Quantity         Price Per        Date of
       of Security          Purchased        Unit ($)         Purchase
       -----------          ---------        --------         --------

      Common Stock                28,041         5.5400         07/06/07


                        Accipiter Capital Management, LLC
                        ---------------------------------
                                      NONE

                              Candens Capital, LLC
                              --------------------
                                      NONE

                                  Gabe Hoffman
                                  ------------
                                      NONE