UNLESS PERMITTED UNDER SECURITIES LEGISLATION, THE HOLDER OF THE
        SECURITIES SHALL NOT TRADE THE SECURITIES BEFORE MARCH 23, 2002.

                                     WARRANT
                            TO PURCHASE COMMON SHARES
                                       OF
                                  HEMOSOL INC.

THIS IS TO CERTIFY THAT for good and valuable consideration (the receipt and
sufficiency of which are hereby acknowledged), Hemosol Inc. (the "Corporation"),
a corporation incorporated under the laws of Ontario, hereby grants to MDS Inc.
("MDS") the right at any time and from time to time during the periods set forth
in Section 2.1 hereof to purchase from the Corporation up to six million
(6,000,000) Common Shares in the capital of the Corporation (subject to
adjustment as provided in Article 3 hereof), in whole or in part, at a price per
share equal to the Exercise Price (subject to adjustment as provided in Article
3 hereof), upon the terms and conditions and pursuant to the provisions
hereinafter provided.

                                    ARTICLE 1
                                 INTERPRETATION

1.1      DEFINITIONS

Where used herein or in any amendments hereto, the following terms shall have
the following meanings, respectively:

"BUSINESS DAY" means any day other than (i) a Saturday or Sunday; or (ii) any
other day on which banking institutions are authorized or required by law,
executive order or governmental decree to be closed in Toronto.

"CAPITAL REORGANIZATION" has the meaning attributed to such term in Section
3.1(d);

"CERTIFICATE OF THE CORPORATION" means an instrument signed in the name of the
Corporation and without personal liability by any two of the Chairman, the
President, the Chief Financial Officer, any Vice President, the Treasurer or the
Secretary of the Corporation certifying the matters specified therein;

"CLOSE OF BUSINESS" means 5 p.m. (Toronto time);

"COMMON SHARES" means the common shares in the capital of the Corporation, as
such shares exist at the Close of Business on the date of execution and delivery
of this Warrant; provided that, in the event of a subdivision, redivision,
reduction, combination or consolidation thereof, or such successive
subdivisions, redivisions, reductions, combinations or consolidations, then,
subject to adjustments, if any, having been made in accordance with Section 3.1,
"Common Shares" shall thereafter mean the shares resulting from such
subdivision, redivision, reduction, combination or consolidation;

"CORPORATION" means Hemosol Inc. and its successors from time to time;

"CURRENT MARKET PRICE PER COMMON SHARE" has the meaning attributed to such term
in Section 3.2(e);



                                       -2-

"DIRECTOR" means a director of the Corporation for the time being and
"Directors" means the board of directors of the Corporation or, whenever duly
empowered, a committee of the board of directors of the Corporation, and
reference to action by the Directors means action by the directors as a board or
action by such a committee of the board as a committee;

"DIVIDENDS PAID IN THE ORDINARY COURSE" means dividends paid on the Common
Shares in any financial year of the Corporation, whether in (1) cash; (2) shares
of the Corporation; (3) rights, options or warrants to purchase any shares,
property or other assets of the Corporation (but excluding rights, options or
warrants referred to in Section 3.1(a)(i) or (ii)); or (4) property or other
assets of the Corporation. For the purposes of the foregoing, where any dividend
is paid, otherwise than in cash, any securities, property or other assets so
distributed by way of dividend shall be valued at the fair market value of such
securities, property or other assets, as the case may be, as determined by the
Directors, which determination shall be conclusive;

"EXERCISE PRICE" means $1.00 per Common Share as adjusted from time to time
pursuant to Article 3 of this Warrant;

"EXPIRY DATE" means the last date on which this Warrant can be exercised for
Common Shares as provided in Section 2.1;

"HOLDER" means MDS;

"LOAN" means the Cdn$20 million non-revolving credit facility provided to the
Corporation by The Bank of Nova Scotia pursuant to a commitment letter dated
October 25, 2002, and guaranteed by MDS;

"LOAN REPAYMENT DATE" means the day on which the Loan has been repaid in full by
either the Corporation or MDS.

"RIGHTS OFFERING" and "RIGHTS PERIOD" have the meanings attributed to such terms
in Section 3.1(b);

"SHARE REORGANIZATION" has the meaning attributed to such term in Section
3.1(a);

"SPECIAL DISTRIBUTION" has the meaning attributed to such term in Section
3.1(d);

"TIME OF EXPIRY" has the meaning attributed to such term in Section 2.1;

"TSX" means the Toronto Stock Exchange;

"UNDERLYING SECURITIES" means the Common Shares issuable upon the exercise of
the Warrants; and

"WARRANT" means this Warrant and includes any new warrant or warrants issued
pursuant to Sections 3.1 or 3.2.



                                       -3-

1.2      EXTENDED MEANINGS

Unless elsewhere herein otherwise expressly provided or unless the context
otherwise requires, words importing the singular include the plural and vice
versa and words importing the masculine gender include the feminine and neuter
genders.

1.3      INTERPRETATION NOT AFFECTED BY HEADINGS, ETC.

The division of this Warrant into Articles and Sections and the insertion of
headings are for convenience of reference only and shall not affect the
construction or interpretation of this Warrant. The terms "this Warrant",
"hereof", "herein", "hereunder" and similar expressions refer to this Warrant
and not to any particular Article, Section or other portion hereof and include
any agreement or instrument supplementary or ancillary hereto.

1.4      TIME

Time shall be of the essence of this Warrant.

1.5      DAY NOT A BUSINESS DAY

In the event that any day on or before which any action is required to be taken
hereunder is not a Business Day, then such action shall be required to be taken
on or before the requisite time on the next succeeding day that is a Business
Day.

1.6      APPLICABLE LAW

This Warrant shall be governed by and be construed in accordance with the laws
of the Province of Ontario and the federal laws of Canada applicable therein,
and each of the holder and the Corporation hereby irrevocably and
unconditionally attorns to the non-exclusive jurisdiction of the courts of the
Province of Ontario.

                                   ARTICLE 2
                               EXERCISE OF WARRANT

2.1      EXERCISE PERIOD

                  As to 5,000,000 Common Shares, this Warrant may be exercised
at any time or from time to time on a Business Day from the date hereof to and
including the day prior to the later of:

         (a)      November 22, 2005; and

         (b)      if the Loan Repayment Date occurs after February 22, 2004, the
                  earlier of (i) the first anniversary of the Loan Repayment
                  Date, and (ii) November 22, 2007.

                  In the event the Loan Repayment Date occurs after February 22,
2004, this Warrant may be exercised as to the number of additional Common Shares
shown in the column below entitled "Number of Shares" at any time or from time
to time on a Business Day during



                                       -4-

the period commencing on the corresponding date shown in the column entitled
"Start Date" below to and including the corresponding date shown in the column
entitled "End Date" below:



NUMBER OF SHARES           START DATE                END DATE
- ----------------        -----------------        -----------------
                                           
    333,333             February 22, 2004        February 22, 2007
    333,333              March 22, 2004           March 22, 2007
    333,334              April 22, 2004           April 22, 2007


                  Notwithstanding the foregoing, the holder shall not be
entitled to exercise this Warrant in respect of the number of Common Shares
shown under the heading "Number of Shares" where the corresponding date shown
under the heading "Start Date" is on or after the Loan Repayment Date.

                  Subject to the limitations above, this Warrant may be
exercised for all or any part of the whole number of Common Shares purchasable
upon its exercise; provided, however, that this Warrant shall be void and all
rights represented hereby shall cease unless exercised before the Close of
Business on the Expiry Date (such time and date being referred to as the "Time
of Expiry").

2.2      MANNER OF EXERCISE

To exercise this Warrant, in whole or in part, the holder shall deliver to the
Corporation at the address specified in Section 6.5 before the Close of Business
on the applicable last day for exercise as set out in Section 2.1 (i) a written
notice in substantially the form of Exhibit A hereto of such holder's election
to exercise this Warrant, which notice shall specify the number of whole Common
Shares to be purchased, (ii) a certified cheque or cheques or bank draft payable
to the order of the Corporation in an amount equal in the aggregate to the
product of the Exercise Price multiplied by the number of Common Shares as to
which this Warrant is exercised, and (iii) this Warrant. Upon receipt thereof,
the Corporation shall, as promptly as practicable, and in any event within ten
Business Days thereafter, execute or cause to be executed, and deliver to such
holder, a certificate or certificates representing the aggregate number of
Common Shares issuable upon such exercise. The share certificate or certificates
so delivered shall be in such denominations as may be specified in such notice
and shall be registered in the name of such holder or such other name as shall
be designated in such notice. This Warrant shall be deemed to have been
exercised and such certificate or certificates shall be deemed to have been
issued, and such holder or any other person so designated to be named therein
shall be deemed to have become a holder of record of such Common Shares for all
purposes, as of the Close of Business on the date such notice, together with
such cheque or cheques, and this Warrant, are received by the Corporation as
aforesaid. If this Warrant shall have been exercised and/or surrendered in part,
the Corporation shall, at the time of delivery of the certificate or
certificates representing the Common Shares issuable upon such exercise, deliver
to the holder hereof a new Warrant evidencing the rights of such holder to
purchase the unpurchased Common Shares called for by this Warrant, which new
Warrant shall in all other respects be identical with this Warrant, or, at the
request of such holder, appropriate notation may be made on this Warrant and the
same returned to such holder.



                                       -5-

                                    ARTICLE 3
                                   ADJUSTMENTS

3.1      ADJUSTMENT OF EXERCISE PRICE

                  The Exercise Price and the number of Common Shares which may
be subscribed for upon exercise of the Warrant shall be subject to adjustment
from time to time upon the occurrence of any of the events and in the manner
provided as follows:

         (a)      If and whenever at any time prior to the Time of Expiry, the
                  Corporation shall:

                  (i)      declare a dividend or make a distribution on its
                           Common Shares payable in Common Shares (or securities
                           exchangeable for or convertible into Common Shares),
                           other than a dividend (other than a stock dividend)
                           paid in the ordinary course; or

                  (ii)     subdivide or change its outstanding Common Shares
                           into a greater number of Common Shares; or

                  (iii)    reduce, combine or consolidate its outstanding Common
                           Shares into a lesser number,

                  (any of such events in these clauses 3.1(a)(i), (ii) and (iii)
                  being called a "Share Reorganization"), then effective
                  immediately after the record date or effective date, as the
                  case may be, at which the holders of Common Shares are
                  determined for the purposes of the Share Reorganization the
                  Exercise Price shall be adjusted to a price determined by
                  multiplying the applicable Exercise Price in effect on such
                  effective date or record date by a fraction, the numerator of
                  which shall be the number of Common Shares outstanding on such
                  effective date or record date before giving effect to such
                  Share Reorganization and the denominator of which shall be the
                  number of Common Shares outstanding immediately after giving
                  effect to such Share Reorganization (including, in the case
                  where securities exchangeable for or convertible into Common
                  Shares are distributed, the number of additional Common Shares
                  that would have been outstanding had such securities been
                  exchanged for or converted into Common Shares immediately
                  after giving effect to such Share Reorganization).

         (b)      If and whenever at any time prior to the Time of Expiry the
                  Corporation shall fix a record date for the issuing of rights,
                  options or warrants to all or substantially all of the holders
                  of the Common Shares entitling them for a period expiring not
                  more than 45 days after such record date (the "Rights Period")
                  to subscribe for or purchase Common Shares (or securities
                  convertible into or exchangeable for Common Shares) at a price
                  per share (or having a conversion or exchange price per share)
                  which is less than 95% of the Current Market Price per Common
                  Share (as hereinafter defined) on the record date for such
                  issue (any of such events being called a "Rights Offering"),
                  then effective immediately after the end of the Rights Period
                  the Exercise Price shall be adjusted to a price determined by
                  multiplying



                                       -6-

                  the applicable Exercise Price in effect at the end of the
                  Rights Period by a fraction the numerator of which shall be
                  the sum of:

                  (i)      the number of Common Shares outstanding as of the
                           record date for the Rights Offering; and

                  (ii)     a number determined by dividing (A) either the
                           product of (i) the number of Common Shares issued
                           during the Rights Period upon exercise of the rights,
                           warrants or options under the Rights Offering and
                           (ii) the price at which such Common Shares are
                           issued, or, as the case may be, the product of (iii)
                           the number of Common Shares for or into which the
                           convertible or exchangeable securities issued during
                           the Rights Period upon exercise of the rights,
                           warrants or options under the Rights Offering are
                           exchangeable or convertible and (iv) the exchange or
                           conversion price of the convertible or exchangeable
                           securities so issued, by (B) the Current Market Price
                           per Common Share as of the record date for the Rights
                           Offering, and

                  the denominator of which shall be the number of Common Shares
                  outstanding (including the number of Common Shares actually
                  issued or subscribed for during the Rights Period upon
                  exercise of the rights, warrants or options under the Rights
                  Offering) or which would be outstanding upon the conversion or
                  exchange of all convertible or exchangeable securities issued
                  during the Rights Period upon exercise of the rights, warrants
                  or options under the Rights Offering, as applicable, in each
                  case after giving effect to the Rights Offering.

                  Common Shares owned by or held (otherwise than as security)
                  for the account of the Corporation or any subsidiary of the
                  Corporation shall be deemed not to be outstanding for the
                  purpose of any such computation. In order to give effect to
                  the provisions of Section 3.1(e) in the circumstances
                  described below, any holder who shall have exercised his right
                  to purchase Common Shares during the period beginning
                  immediately after the record date for a Rights Offering and
                  ending on the last day of the Rights Period therefor, in
                  addition to the Common Shares to which he is otherwise
                  entitled upon such exercise, shall be entitled to that number
                  of additional Common Shares equal to the result obtained when
                  the difference, if any, between the Exercise Price in effect
                  immediately prior to the end of such Rights Offering and the
                  Exercise Price, as adjusted for such Rights Offering pursuant
                  to this Section 3.1(b), is multiplied by the number of Common
                  Shares purchased upon exercise of the Warrant held by such
                  holder during such period, and the resulting product is
                  divided by the Exercise Price, as adjusted for such Rights
                  Offering pursuant to this Section 3.1(b). Such additional
                  Common Shares shall be deemed to have been issued to the
                  holder immediately following the end of the Rights Period and
                  a certificate for such additional Common Shares shall be
                  delivered to such holder within 10 Business Days following the
                  end of the Rights Period.

         (c)      If and whenever at any time prior to the Time of Expiry the
                  Corporation shall fix a record date for the payment, issue or
                  distribution to all or substantially all of the



                                       -7-

                  holders of the Common Shares of (i) a dividend, (ii) cash or
                  assets (including evidences of the Corporation's
                  indebtedness), or (iii) rights or other securities (including
                  without limitation, securities convertible into or
                  exchangeable for Common Shares), and such payment, issue or
                  distribution does not constitute a dividend (other than a
                  stock dividend) paid in the ordinary course, a Share
                  Reorganization or a Rights Offering (any of such non-excluded
                  events being herein called a "Special Distribution"), the
                  Exercise Price shall be adjusted effective immediately after
                  such record date to a price determined by multiplying the
                  applicable Exercise Price in effect on such record date by a
                  fraction:

                  (i)      the numerator of which shall be:

                           (A)      the product of the number of Common Shares
                                    outstanding on such record date and the
                                    Current Market Price per Common Share on
                                    such record date; less

                           (B)      the fair market value, as determined by
                                    action of the Directors (whose determination
                                    shall be conclusive), to the holders of the
                                    Common Shares of such dividend, cash,
                                    assets, rights or securities so paid, issued
                                    or distributed less the fair market value,
                                    as determined by action of the Directors
                                    (whose determination shall be conclusive),
                                    of the consideration, if any, received
                                    therefor by the Corporation, and

                  (ii)     the denominator of which shall be the number of
                           Common Shares outstanding on such record date
                           multiplied by the Current Market Price per Common
                           Share on such record date.

                  Any Common Shares owned by or held (otherwise than as
                  security) for the account of the Corporation or any subsidiary
                  of the Corporation shall be deemed not to be outstanding for
                  the purpose of any such computation. Such adjustment shall be
                  made successively whenever such a record date is fixed. To the
                  extent that such payment, issuance or distribution is not so
                  made, the Exercise Price shall be readjusted effective
                  immediately to the Exercise Price which would then be in
                  effect based upon such payment, issuance or distribution
                  actually made.

         (d)      If and whenever at any time prior to the Time of Expiry there
                  shall be a reorganization, reclassification or other change of
                  Common Shares outstanding at such time or change of the Common
                  Shares into other shares or into other securities (other than
                  a Share Reorganization), or a consolidation, amalgamation,
                  arrangement or merger of the Corporation with or into any
                  other corporation or other entity (other than a consolidation,
                  amalgamation, arrangement or merger which does not result in
                  any reclassification of the outstanding Common Shares or a
                  change of the Common Shares into other shares), or a transfer
                  of the undertaking or assets of the Corporation as an entirety
                  or substantially as an entirety to another corporation or
                  entity in which the holders of Common Shares are entitled to
                  receive shares, other securities or property, including cash,
                  (any of



                                       -8-

                  such events being herein called a "Capital Reorganization"),
                  the holder upon the exercise of the right to subscribe for and
                  purchase Common Shares pursuant to the exercise of this
                  Warrant after the effective date of such Capital
                  Reorganization shall be entitled to receive, and shall accept
                  for the same aggregate consideration in lieu of the number of
                  Common Shares to which such holder was theretofore entitled
                  upon such exercise, the aggregate number of shares, other
                  securities or other property, including cash, which such
                  holder would have received as a result of such Capital
                  Reorganization had such holder exercised his right to acquire
                  Underlying Securities immediately prior to the effective date
                  or record date, as the case may be, of the Capital
                  Reorganization and had such holder been the holder of such
                  Underlying Securities on such effective date or record date,
                  as the case may be, subject to adjustment thereafter in
                  accordance with provisions the same, as nearly as may be
                  possible, as those contained in Sections 3.1(b) and 3.1(c)
                  hereof. If determined appropriate by the Directors, acting
                  reasonably, appropriate adjustments shall be made as a result
                  of any such Capital Reorganization in the application of the
                  provisions set forth in this Section 3.1, with respect to the
                  rights and interests thereafter of the holder of this Warrant
                  to the end that the provisions set forth in this Section 3.1
                  shall thereafter correspondingly be made applicable as nearly
                  as may reasonably be in relation to any shares, other
                  securities or other property, including cash, thereafter
                  deliverable upon the exercise of the Warrant. Any such
                  adjustment shall be made by and set forth in an agreement
                  supplemental hereto approved by action by the Directors,
                  acting reasonably, and shall for all purposes be conclusively
                  deemed to be an appropriate adjustment.

         (e)      If and whenever at any time prior to the Time of Expiry there
                  shall occur a Share Reorganization, a Rights Offering or a
                  Special Distribution and any such event results in an
                  adjustment to the Exercise Price pursuant to the provisions of
                  this Section 3.1, the number of Common Shares purchaseable (at
                  the adjusted Exercise Price) shall be adjusted
                  contemporaneously with the adjustment of the Exercise Price by
                  multiplying the number of Common Shares theretofore
                  purchaseable on the exercise thereof by a fraction, the
                  numerator of which shall be the applicable Exercise Price in
                  effect immediately prior to such adjustment and the
                  denominator of which shall be the applicable Exercise Price
                  resulting from such adjustment.

         (f)      In case the Corporation after the date of issue of this
                  Warrant shall take any action affecting the Common Shares,
                  other than action described in this Section 3.1, which in the
                  opinion of the Directors, acting reasonably, would materially
                  adversely affect the rights of the holder, the Exercise Price
                  or the number of Common Shares purchaseable upon exercise
                  shall be adjusted in such manner, if any, and at such time, by
                  action by the Directors, acting reasonably, as they may
                  determine to be equitable in the circumstances, but subject in
                  all cases to the prior approval of the TSX and any other
                  necessary regulatory approval.



                                       -9-

3.2      RULES REGARDING CALCULATION OF ADJUSTMENT OF EXERCISE PRICE

                  For the purposes of Section 3.1 hereof, any adjustment shall
be made successively whenever an event referred to therein shall occur, subject
to the following provisions:

         (a)      all calculations shall be made to the nearest 1/100th of a
                  Common Share;

         (b)      no adjustment to an Exercise Price shall be required unless
                  such adjustment would result in a change of at least 1% in the
                  prevailing Exercise Price and no adjustment in the number of
                  Common Shares purchasable upon exercise of this Warrant will
                  be required to be made unless the cumulative effect of such
                  adjustment or adjustments would change the number of Common
                  Shares purchasable upon the exercise of this Warrant by at
                  least one one-hundredth of a Common Share and, for greater
                  clarity, any adjustment which, except for the qualification of
                  this clause, would otherwise have been required to be made
                  shall be carried forward and taken into account in any
                  subsequent adjustment; provided, however, that in no event
                  shall the Corporation be obligated to issue fractional Common
                  Shares or fractional interests in Common Shares upon exercise
                  of this Warrant or pay any amount in cash in lieu of issuing
                  fractional Common Shares;

         (c)      if a dispute shall at any time arise with respect to
                  adjustments to the Exercise Price or the number of Common
                  Shares purchaseable pursuant to the exercise rights
                  represented by this Warrant, such disputes shall be
                  conclusively determined by the Corporation's auditors or, if
                  they are unable or unwilling to act, by such other firm of
                  independent chartered accountants as may be selected by action
                  by the Directors and any such determination shall be
                  conclusive evidence of the correctness of any adjustments
                  made;

         (d)      if the Corporation shall set a record date to determine the
                  holders of its Common Shares for the purpose of entitling them
                  to receive any dividend or distribution or any subscription or
                  purchase rights, options or warrants and shall thereafter and
                  before the distribution to such shareholders of any such
                  dividend, distribution or subscription or purchase rights
                  legally abandon its plan to pay or deliver such dividend,
                  distribution or subscription or purchase rights, then no
                  adjustment in the Exercise Price or the number of Common
                  Shares purchaseable upon exercise of the Warrant shall be
                  required by reason of the setting of such record date; and

         (e)      "Current Market Price per Common Share", at any date, means
                  the weighted average price per Common Share at which the
                  Common Shares have traded on the TSX (or, if the Common Shares
                  are not so listed, then on the stock exchange on which the
                  Common Shares are listed on which the greatest volume of
                  Common Shares were traded during the period referenced below
                  or, if the Common Shares are not so listed on any stock
                  exchange, then on the over-the-counter market on which the
                  Common Shares are traded as selected by action of the
                  Directors acting reasonably for such purpose), during the 20
                  most recent trading days ending on the fifth trading day
                  before such date on which there has



                                      -10-

                  occurred at least one trade of at least one board lot of
                  Common Shares prior to such date, such weighted average price
                  to be determined by dividing the aggregate sale price of all
                  Common Shares sold in board lots on such exchange or market,
                  as the case may be, during the said 20 trading days, by the
                  number of Common Shares so sold.

3.3      PROCEEDINGS PRIOR TO ANY ACTION REQUIRING ADJUSTMENT

As a condition precedent to the taking of any action which would require an
adjustment pursuant to Section 3.1, the Corporation shall take any action that
may, in the opinion of counsel, be necessary in order that the Corporation may
validly and legally issue as fully paid and non-assessable all the Underlying
Securities that the holder is entitled to receive on the full exercise thereof
in accordance with the provisions hereof.

3.4      NOTICES

Upon each adjustment or re-adjustment of the Exercise Price or in the nature of
the Common Shares, securities or other property receivable upon the exercise of
this Warrant, the Corporation promptly shall prepare and mail, by first class
mail, postage prepaid, to the registered holder of this Warrant a certificate
setting forth such adjustment or re-adjustment and stating the facts upon which
such adjustment or re-adjustment is based, including a statement of the kind and
amount of shares, securities or other property thereafter to be received upon
the exercise of this Warrant.

                                   ARTICLE 4
                          COVENANTS OF THE CORPORATION

4.1      COVENANTS OF THE CORPORATION

The Corporation hereby covenants with the holder of this Warrant that so long as
this Warrant shall remain outstanding and may be exercised:

         (a)      all Common Shares that may be issued upon the exercise of the
                  rights represented by this Warrant will, upon issuance, be
                  validly issued and fully paid and non-assessable;

         (b)      during the period within which the rights represented by this
                  Warrant may be exercised, the Corporation will at all times
                  have authorized and reserved for issuance a sufficient number
                  of its Common Shares to provide for the exercise of the rights
                  represented by this Warrant;

         (c)      the Corporation will maintain in full force and effect its
                  existence;

         (d)      the Corporation shall use its reasonable best efforts to
                  maintain in good standing the listing of the Common Shares on
                  the TSX, or such other stock exchange upon which the Common
                  Shares may be listed; and



                                      -11-

         (e)      the Corporation will keep its transfer register open during
                  normal business hours in the City of Toronto.

4.2         MERGERS, SUCCESSORS

Nothing in this Warrant shall prevent any consolidation, reorganization,
arrangement, amalgamation or merger of the Corporation with or into any other
body corporate or person; provided, however, that the body corporate or person
formed by such consolidation or amalgamation or into which such merger shall
have been made shall succeed to and be substituted for the Corporation hereunder
with the same effect as if it had been a party hereto. Such changes may be made
to the Warrant as the Directors of the Corporation determine may be appropriate
in view of any such consolidation, reorganization, arrangement, amalgamation or
merger.

                                   ARTICLE 5
                             ACKNOWLEDGEMENT OF MDS

5.1      ACKNOWLEDGEMENT OF MDS

The holder hereby acknowledges that this Warrant and the Common Shares issued
pursuant hereto are and will be subject to resale restrictions under applicable
securities laws, rules and regulations and policies.

                                   ARTICLE 6
                               GENERAL PROVISIONS

6.1      EXCHANGES

         (a)      This Warrant may be exchanged for another warrant or warrants
                  entitling the holder thereof to purchase in the aggregate the
                  same number of Common Shares as are purchasable under the
                  Warrant so exchanged upon the same terms as under the Warrant
                  so exchanged.

         (b)      This Warrant may be exchanged only at the offices of the
                  Corporation or at any other place that is designated by the
                  Corporation. Any Warrant tendered for exchange shall be
                  surrendered to the Corporation and be cancelled.

6.2      CANCELLATION

A holder may at any time tender this Warrant to the Corporation for cancellation
and the Corporation shall cancel this Warrant and make the appropriate notations
on its registers.

6.3      REGISTRATION OF HOLDERS OF WARRANT AND TRANSFERS

         (a)      The Corporation shall cause to be kept at its offices or at
                  such other places as may be designated by the Corporation from
                  time to time registers in which the holder or holders of this
                  Warrant shall be registered. The name and address of each
                  holder so registered and the particulars of the Warrant held
                  by him shall be



                                      -12-

                  entered into the register in which the Warrant is registered.
                  No transfer of this Warrant shall be valid unless made on the
                  register.

         (b)      The Corporation shall not be charged with notice of or be
                  bound to see to the execution of any trusts, whether express,
                  implied or constructive in respect of this Warrant and may
                  transfer the same on the direction of the registered holder
                  thereof, whether named as trustee or otherwise, as though that
                  person were the beneficial holder thereof.

         (c)      The holder may transfer all or part of the Warrant provided
                  the holder or its administrators or other legal
                  representatives comply with such reasonable requirements as
                  the Corporation may prescribe, including compliance with all
                  applicable securities legislation. The transferee of all or
                  part of the Warrant shall, after (i) a form of transfer
                  acceptable to the Corporation, such as the form in Exhibit B
                  hereto, duly completed, and (ii) the certificate representing
                  the Warrant, are deposited with the Corporation, and upon
                  compliance with all other reasonable requirements of the
                  Corporation or law, be entitled to have its name entered on
                  the register as the holder of such part or all of the Warrant
                  so transferred free from all equities or rights of set-off or
                  counterclaim between the Corporation and the transferor or any
                  other previous holder of such Warrant (or part thereof), save
                  in respect of equities which the Corporation is required to
                  take notice by statute or by order of a court of competent
                  jurisdiction.

6.4      LOSS OR MUTILATION

Upon receipt by the Corporation of evidence reasonably satisfactory to it of the
ownership of and the loss, theft, destruction or mutilation of this Warrant and
(in case of loss, theft or destruction) of indemnity reasonably satisfactory to
it, and in case of mutilation, upon surrender and cancellation hereof, the
Corporation will execute and deliver in lieu hereof a new Warrant of like tenor.

6.5      COMMUNICATIONS

All communications provided for hereunder shall be delivered, addressed (a) if
to the Corporation, at: 2585 Meadowpine Blvd., Mississauga, Ontario L5N 8H9;
Attention: Lee Hartwell, Vice President, Corporate Development and Chief
Financial Officer and Secretary, or (b) if to MDS, at 100 International
Boulevard, Etobicoke, Ontario M9W 6J6, Attention: General Counsel. Any address
may be changed from time to time and shall be the most recent address furnished
in writing, if by the holder of the Warrant, to the Corporation, or, if by the
Corporation, to the holder of the Warrant. Except as otherwise provided herein,
any communication shall be deemed to have been given when delivered.

6.6      LIMITATION OF LIABILITY, ETC.

No provision of this Warrant, in the absence of affirmative action by the holder
hereof to purchase Common Shares or other securities, and no mere enumeration in
this Warrant of the rights or privileges of the holder hereof, shall give rise
to any liability of such holder for the Exercise Price or as a shareholder of
the Corporation, whether such liability is asserted by the



                                      -13-

Corporation or by creditors of the Corporation. No holder hereof shall have any
rights as a shareholder of the Corporation until such holder exercises this
Warrant in accordance with the provisions hereof.

6.7      CURRENCY OF PAYMENT

Any amounts payable hereunder shall be paid in lawful money of Canada.

6.8      BINDING EFFECT

All covenants and agreements of the Corporation contained herein shall be
binding upon the Corporation and its successors, and shall enure to the benefit
of the holder, its successors and assigns.

6.9      SEVERABILITY

If any provision hereof shall be held to be void, illegal or unenforceable, to
the extent permitted by law, such provision shall be deemed severable from the
remaining provisions hereof which shall remain in full force and effect.

6.10     MODIFICATIONS

No amendment, modification, consent or waiver by the holder shall be effective
unless made in writing and signed by the holder hereof.

IN WITNESS WHEREOF, the Corporation and the holder have duly caused this Warrant
to be executed as of November 22, 2002.

                                  HEMOSOL INC.

                                  By: /s/ LEE HARTWELL
                                      ----------------------------

                                  MDS INC.

                                  By: /s/ PETER BRENT
                                      ----------------------------

THE SECURITIES REPRESENTED HEREBY HAVE NOT BEEN REGISTERED UNDER THE UNITED
STATES SECURITIES ACT OF 1933, AS AMENDED, AND MAY ONLY BE SOLD OR OTHERWISE
TRANSFERRED BY THE HOLDER IN ACCORDANCE WITH, OR PURSUANT TO AN EXEMPTION FROM,
ALL APPLICABLE PROVISIONS OF SUCH STATUTE.



                              EXHIBIT A TO WARRANT
                                SUBSCRIPTION FORM

                 (To be executed only upon exercise of Warrant)

The undersigned registered holder of this Warrant irrevocably exercises this
Warrant for and purchases ________ Common Shares in the capital of Hemosol Inc.
purchasable with this Warrant, and herewith makes payment therefor (by certified
cheque or bank draft) in the amount of $ __________ , all at the price and on
the terms and conditions specified in this Warrant, and requests that
certificates for the Common Shares hereby purchased (and any securities or other
property issuable upon such exercise) be issued in the name of and delivered to
_____________________________________________________________ whose address is
_______________________________________________________________________________,
and, if such Common Shares shall not include all of the Common Shares issuable
as provided in this Warrant, that a new Warrant of like tenor and date for the
balance of the Common Shares issuable under this Warrant be delivered to the
undersigned.

Dated:

                                          ______________________________________
                                          (Signature of Registered Owner)

                                          ______________________________________
                                          (Street Address)

                                          ______________________________________
                                          (City)(Province)(Postal Code)



                              EXHIBIT B TO WARRANT
                                FORM OF TRANSFER

            FOR VALUE RECEIVED, the undersigned hereby sells, assigns and
transfers unto (name) __________________________ (the "Transferee"), of
(residential address) _______________________________________________ the
attached Warrant of Hemosol Inc. (the "Corporation") registered in the name of
the undersigned on the records of the Corporation represented by the within
certificate and irrevocably appoints ___________________________ as the attorney
of the undersigned to transfer the said securities on the books of the
Corporation with full power of substitution. If the undersigned is a U.S. Person
(as defined in Regulation S under the U.S. Securities Act of 1933, as amended, a
"U.S. PERSON"), the undersigned represents that the transferee is not a U.S.
Person.

            DATED the _______ day of __________________, _________.

______________________                __________________________________________
Signature Guaranteed                  Signature of Warrantholder, to be the same
                                      as appears on the face of this Warrant
                                      Certificate)