(HEMOSOL LOGO)

                                     PROXY

         SOLICITED BY MANAGEMENT FOR THE ANNUAL AND SPECIAL MEETING OF
     SECURITYHOLDERS TO BE HELD ON APRIL 20, 2004 AND ANY ADJOURNMENT(S) OR
                            POSTPONEMENT(S) THEREOF

     Reference  is made to the accompanying Management Information Circular (the
"Circular") dated March 10, 2004 relating to the Annual and Special Meeting (the
"Meeting") of securityholders of  Hemosol Inc. ("Hemosol") to  be held on  April
20, 2004 and any adjournment(s) or postponement(s) thereof.

     The undersigned holder of (i) warrants to purchase common shares of Hemosol
and/or  (ii) broker  compensation options to  purchase common  shares and common
share purchase  warrants  of  Hemosol (collectively,  the  "Securities")  hereby
appoints  Lee D.  Hartwell, the Chief  Executive Officer of  Hemosol, or failing
him, Edward  E. McCormack,  member of  the  Board of  Directors of  Hemosol,  or
failing  him,  George W.  Masters, Vice-Chairman  of the  Board of  Directors of
Hemosol, or instead of any of the foregoing,
- ------------------------------------------------------------, as the nominee  of
the  undersigned to attend and  act for and on behalf  of the undersigned at the
Meeting, to the same extent  and with the same power  as if the undersigned  was
personally  present at the said Meeting, with power of substitution and, without
limiting the generality of the power hereby conferred, the nominees named  above
are  specifically directed to vote the Securities  registered in the name of the
undersigned as specified below:

1.   FOR  [ ]     AGAINST  [ ]

     (or if no specification is made, vote "FOR") a special resolution, the full
     text of which is set  out as Annex A to  the Circular, approving a plan  of
     arrangement   (the  "Arrangement")  under  section   182  of  the  Business
     Corporations Act (Ontario) involving  Hemosol, its securityholders and  MDS
     Inc.,  providing  for  a  reorganization  of  Hemosol's  business  to allow
     Hemosol's business to  exchange, in  effect, a significant  portion of  its
     existing  and unutilized tax losses and other  tax assets for a $16 million
     cash infusion, all  as more  particularly described  and set  forth in  the
     Circular.


The  undersigned ratifies and confirms all that  the nominee may do by virtue of
the power granted hereby.

DATED THIS
- --------------------- DAY OF
- ------------------------------------, 2004.

                                         ---------------------------------------
                                         Signature of Securityholder

                                         ---------------------------------------
                                         Name of Securityholder
                                         (please print)

NOTES:

1.   If undated, this Form of Proxy shall be deemed to bear the date on which it
     is mailed by or on behalf of management of Hemosol.

2.   The Securities to which  this Form of  Proxy relates will  be voted for  or
     against  the resolution referred to above  in accordance with the foregoing
     instructions.

3.   A  HOLDER  OF  SECURITIES  MAY  APPOINT  A  PERSON  (WHO  NEED  NOT  BE   A
     SECURITYHOLDER  OF HEMOSOL), OTHER THAN THE PERSONS DESIGNATED IN THIS FORM
     OF PROXY,  AS  NOMINEE  TO  ATTEND  AND ACT  FOR  AND  ON  BEHALF  OF  THAT
     SECURITYHOLDER  AT THE  MEETING. A holder  of Securities  may exercise that
     right by inserting the name of that  person in the blank space provided  on
     this Form of Proxy or by completing another appropriate Form of Proxy.

4.   This Form of Proxy, when properly executed, confers discretionary authority
     on the persons named therein to vote on any amendment(s) or variation(s) to
     the  resolution  referred to  above.  If any  amendment(s)  or variation(s)
     properly comes  before  the  Meeting,  the  proxy  will  be  voted  in  the
     discretion  of the persons named therein. The persons named in this Form of
     Proxy are directors and/or senior officers of Hemosol.

5.   This Form of Proxy must be signed  and dated by the securityholder or  such
     securityholder's  attorney authorized in writing  or, if the securityholder
     is a corporation, by an officer or attorney thereof duly authorized.

6.   To be effective,  this Form of  Proxy must  be received either  by mail  or
     delivery  addressed  to  Computershare  Trust  Company  of  Canada  at  100
     University Avenue,  9th Floor,  Toronto, Ontario  M5J 2Y1  or by  facsimile
     toll-free  at 1-866-249-7775 (or in the Toronto area at (416) 263-9524), in
     each case prior to 5:00  p.m. (Toronto time) on April  16, 2004 or, if  the
     Meeting  is  adjourned  or postponed,  not  less than  48  hours (excluding
     Saturdays, Sundays and holidays) before  the time the adjourned Meeting  is
     reconvened or the postponed Meeting is convened. The Form of Proxy may also
     be  deposited with the scrutineers of the  Meeting, to the attention of the
     chair of the Meeting,  at or immediately prior  to the commencement of  the
     Meeting or any postponement(s) or adjournment(s) thereof.

7.   Holders  of Securities who also hold common  shares of Hemosol and who wish
     to appoint a nominee to attend the  Meeting and vote such common shares  on
     their  behalf,  must complete  a separate  form of  proxy, printed  on blue
     paper, which form  of proxy is  enclosed with the  Circular mailed to  such
     securityholders  and which  may also  be obtained  from Computershare Trust
     Company of Canada at the address indicated above.