UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                  SCHEDULE 13D

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

                       INTRABIOTICS PHARMACEUTICALS, INC.
                       ----------------------------------
                                (Name of Issuer)

                          Common Stock, $.001 Par Value
                          -----------------------------
                         (Title of Class of Securities)

                                    46116T100
                                 --------------
                                 (CUSIP Number)

                               James E. Kaye, Esq.
                    Akin, Gump, Strauss, Hauer & Feld, L.L.P.
                               590 Madison Avenue
                            New York, New York 10022
                                 (212) 872-1000
                  ---------------------------------------------
                  (Name, Address and Telephone Number of Person
                Authorized to Receive Notices and Communications)

                                 March 30, 2000
                      ------------------------------------
                      (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 ss.ss.240.13d-1(e),  240.13d-1(f) or 240.13d-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 ss.240.13d-7 for other
parties to whom copies are to be sent.

*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 ("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).


                         Continued on following page(s)
                               Page 1 of 15 Pages
                             Exhibit Index: Page 12


                                  SCHEDULE 13D

CUSIP No. 46116T100                                                 Page 2 of 15

1        Names of Reporting Persons
         I.R.S. Identification Nos. of above persons (entities only)

                  INVESTOR AB

2        Check the Appropriate Box If a Member of a Group*
                                                      a.  [_]
                                                      b.  [x]

3        SEC Use Only

4        Source of Funds*

                  Not Applicable

5        Check Box If Disclosure of Legal  Proceedings  Is Required  Pursuant to
         Items 2(d) or 2(e) [_]

6        Citizenship or Place of Organization

                  Sweden

         Number of            7          Sole Voting Power
           Shares                              0
        Beneficially
          Owned By            8         Shared Voting Power
            Each                               3,675,000
         Reporting
           Person             9         Sole Dispositive Power
            With                               0

                              10        Shared Dispositive Power
                                               3,675,000

11       Aggregate Amount Beneficially Owned by Each Reporting Person

                                               3,675,000

12       Check Box If the Aggregate Amount in Row (11) Excludes Certain Shares*

                                               [ ]

13       Percent of Class Represented By Amount in Row (11)

                                       12.31%

14       Type of Reporting Person*

                  OO

                      *SEE INSTRUCTIONS BEFORE FILLING OUT!

                                  SCHEDULE 13D

CUSIP No. 46116T100                                                 Page 3 of 15


1        Names of Reporting Persons
         I.R.S. Identification Nos. of above persons (entities only)

                  INVESTOR GROWTH CAPITAL LIMITED
                  (f/k/a Investor ( Guernsey) Ltd.)

2        Check the Appropriate Box If a Member of a Group*
                                                      a.  [_]
                                                      b.  [x]

3        SEC Use Only

4        Source of Funds*

                  Not Applicable

5        Check Box If Disclosure of Legal  Proceedings  Is Required  Pursuant to
         Items 2(d) or 2(e) [_]

6        Citizenship or Place of Organization

                  Guernsey

         Number of            7          Sole Voting Power
           Shares                              0
        Beneficially
          Owned By            8         Shared Voting Power
            Each                               2,572,500
         Reporting
           Person             9         Sole Dispositive Power
            With                               0

                              10        Shared Dispositive Power
                                               2,572,500

11       Aggregate Amount Beneficially Owned by Each Reporting Person

                                               2,572,500

12       Check Box If the Aggregate Amount in Row (11) Excludes Certain Shares*

                                               [X]

13       Percent of Class Represented By Amount in Row (11)

                                       8.67%

14       Type of Reporting Person*

                  OO

                      *SEE INSTRUCTIONS BEFORE FILLING OUT!


                                                                    Page 4 of 15

          This  Statement  on Schedule  13D  relates to shares of common  stock,
$.001 par value per share (the "Shares"), of IntraBiotics Pharmaceuticals,  Inc.
(the "Issuer").  The securities  reported  herein were previously  reported on a
Schedule 13G, which was filed on September 6, 2000.

Item 1.   Security and Issuer.

          This  Statement  relates to the Shares.  The address of the  principal
executive office of the Issuer is 2021 Stierlin Court, Mountain View, California
94043.

Item 2.   Identity and Background.

          This  Statement  is being  filed on  behalf  of each of the  following
persons (collectively, the "Reporting Persons"):

          i)   Investor Growth Capital Limited (f/k/a Investor  (Guernsey) Ltd.)
               ("Investor Growth"); and

          ii)  Investor AB ("Investor AB").

          This Statement relates to the Shares held for the accounts of Investor
Growth and a limited  partnership  of which  Investor AB serves as the  ultimate
general partner (the "Fund").

                              The Reporting Persons

          Investor  Growth is a Guernsey  company,  with its principal  place of
business at National  Westminster House, Le Truchot,  St. Peter Port,  Guernsey,
Channel  Islands GYI,  4PW.  Investor  Growth is a wholly owned  subsidiary of a
Dutch company, which is a wholly owned subsidiary of a Swedish company, which is
a wholly owned  subsidiary  of Investor AB. The  principal  business of Investor
Growth is investments in securities. Current information concerning the identity
and  background of the directors and officers of Investment  Growth is set forth
in Annex A hereto,  which is  incorporated by reference in response to this Item
2.

          Investor AB, is a publicly  held Swedish  company,  with its principal
place of business at Arsenalsgatan 8c, S-103 32 Stockholm, Sweden. Its principal
business is as a diversified  industrial  holdings company.  Current information
concerning the identity and background of the directors and officers of Investor
AB is set  forth in  Annex B  hereto,  which is  incorporated  by  reference  in
response to this Item 2.

          During the past five years,  none of the Reporting Persons and, to the
best of the Reporting Persons' knowledge, no other person identified in response
to this Item 2 has been (a) convicted in a criminal proceeding or (b) a party to
any  civil  proceeding  as a result  of which  it or he has  been  subject  to a
judgment,  decree or final order enjoining future  violations of, or prohibiting
or mandating activities subject to, federal or state securities laws, or finding
any violations with respect to such laws.

Item 3.   Source and Amount of Funds or Other Consideration.

          The Shares reported herein were previously reported in a Schedule 13G.

          The securities  held for the accounts of Investor  Growth and the Fund
may be held through margin accounts maintained with brokers, which extend margin
credit as and when required to open or carry positions in their margin accounts,
subject to applicable federal margin regulations,  stock exchange rules and such
firms' credit policies.  The positions which may be held in the margin accounts,
including the Shares,  are pledged as  collateral  security for the repayment of
debit balances in the respective accounts.

                                                                    Page 5 of 15


Item 4.   Purpose of Transaction.

          All of the Shares  reported herein as having been acquired or disposed
of from the accounts of Investor  Growth and the Fund were  acquired or disposed
of for investment purposes. Except as set forth below and in Item 6, neither the
Reporting Persons nor, to the best of their knowledge,  any of the other persons
identified  in response to Item 2, has any plans or proposals  that relate to or
would result in any of the transactions  described in subparagraphs  (a) through
(j) of Item 4 of Schedule 13D.

          Liza Page  Nelson,  an employee  of an  affiliate  of Investor  Growth
serves as a director of the Issuer. As a director of the Issuer,  Ms. Nelson may
have influence over the corporate activities of the Issuer, including activities
which may relate to transactions  described in subparagraphs  (a) through (j) of
Item 4 of Schedule 13D.

          The  Reporting  Persons  reserve the right to acquire,  or cause to be
acquired,  additional  securities  of the Issuer,  to dispose of, or cause to be
disposed,  such securities at any time or to formulate other purposes,  plans or
proposals  regarding the Issuer or any of its  securities,  to the extent deemed
advisable in light of general  investment and trading  policies of the Reporting
Persons, market conditions or other factors.

Item 5.   Interest in Securities of the Issuer.

               (a)  (i) Investor  Growth may be deemed the  beneficial  owner of
2,572,500 Shares  (approximately 8.67% of the total number of Shares outstanding
assuming the  exercise  and  conversion  of all of the  securities  held for its
account).  This number consists of A) 2,187,500  Shares held for its account and
B) 385,000  Shares  issuable upon the exercise of 385,000  warrants for Series H
Preferred  Stock  and the  conversion  of such  preferred  shares  held  for its
account.

                    (ii) Investor  AB may be  deemed  the  beneficial  owner  of
3,675,000 Shares (approximately 12.31% of the total number of Shares outstanding
assuming the  exercise  and  conversion  of all of the  securities  held for the
accounts of Investor  Growth and the Fund.) This number consists of A) 2,187,500
Shares held for the account of Investor Growth;  B) 385,000 Shares issuable upon
the exercise of 385,000 warrants for Series H Preferred Stock and the conversion
of such  preferred  shares held for the account of Investor  Growth;  C) 937,500
Shares held for the account of the Fund; and D) 165,000 Shares issuable upon the
exercise of 165,000  warrants for Series H Preferred Stock and the conversion of
such preferred shares held for the account of the Fund.

               (b)  (i)  Investor  Growth may be deemed to have shared  power to
direct the voting and  disposition of the 2,572,500  Shares held for its account
(assuming the exercise of all the warrants for Series H Preferred  Stock and the
conversion  of all such  preferred  shares  held  for its account.

                    (ii) Investor  AB may be  deemed  to have  shared  power  to
direct the voting and  disposition of 3,675,000  Shares held for the accounts of
Investor Growth and the Fund.  This number consists of A) 2,572,500  Shares held
for the account of Investor  Growth  (assuming  the exercise of all the warrants
for Series H Preferred  Stock and the  conversion of all such  preferred  shares
held for the account of Investor  Growth) and B)  1,102,500  Shares held for the
account of the Fund  (assuming  the  exercise of all the  warrants  for Series H
Preferred Stock and the conversion of such preferred shares held for the account
of the Fund).

               (c)  Except  as set  forth in Item 6 below,  there  have  been no
transactions  effected  with  respect to the Shares since April 1, 2001 (60 days
prior to the date hereof) by any of the Reporting Persons.

               (d)  (i) The shareholders of Investor Growth,  including Investor
AB, have the right to  participate  in the  receipt of  dividends  from,  or the
proceeds  from the sale of, the  securities  held for the  account  of  Investor
Growth in accordance with their ownership interests in Investor Growth.

                                                                    Page 6 of 15



                    (ii)The partners of the Fund,  including  Investor  AB, have
the right to participate in the receipt of dividends  from, or the proceeds from
the sale of, the securities  held for the account of the Fund in accordance with
their ownership interests in the Fund.

               (e)  Not applicable.

Item 6.   Contracts, Arrangements,  Understandings or Relationships with Respect
          to Securities of the Issuer.

          As noted in Item 4 above,  Ms. Nelson,  an employee of an affiliate of
Investor Growth serves as a director of the Issuer.

          From time to time,  each of the Reporting  Persons may lend  portfolio
securities  to  brokers,  banks or other  financial  institutions.  These  loans
typically obligate the borrower to return the securities,  or an equal amount of
securities  of the same  class,  to the lender and  typically  provide  that the
borrower is entitled to exercise  voting rights and to retain  dividends  during
the term of the loan.  From time to time, to the extent  permitted by applicable
laws, each of the Reporting Persons may borrow securities, including the Shares,
for the purpose of effecting,  and may effect, short sale transactions,  and may
purchase  securities  for the  purpose of closing  out short  positions  in such
securities.

          Except as set  forth  above,  the  Reporting  Persons  do not have any
contracts,  arrangements,  understandings  or relationships  with respect to any
securities of the Issuer.

Item 7.   Material to be Filed as Exhibits.

          The Exhibit Index is incorporated herein by reference.




                                                                    Page 7 of 15


                                   SIGNATURES



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



Date:     June 1, 2001           INVESTOR GROWTH CAPITAL LIMITED
                                 (f/k/a Investor (Guernsey) Ltd.)


                                 By:   /S/ MICHAEL OPORTO
                                       -----------------------------------------
                                       Michael Oporto
                                       Attorney-in-Fact


                                 By:   /S/ BORJE EKHOLM
                                       -----------------------------------------
                                       Borje Ekholm
                                       Attorney-in-Fact




Date:     June 1, 2001           INVESTOR AB


                                 By:   /S/ MICHAEL OPORTO
                                       -----------------------------------------
                                       Michael Oporto
                                       Attorney-in-Fact


                                 By:   /S/ BORJE EKHOLM
                                       -----------------------------------------
                                       Borje Ekholm
                                       Attorney-in-Fact








                                                                                                            Page 8 of 15

                                                         ANNEX A

                                Directors and Officers of Investor Growth Capital Limited
                                            (f/k/a Investor (Guernsey) Ltd.)


Name/Title/Citizenship                            Principal Occupation                     Business Address
----------------------                            --------------------                     ----------------
                                                                                     


    David C. Jeffreys                             Managing Director of                     National Westminster House
    A-Director                                    Abacus Financial Services (Guernsey)     Le Truchot, St. Peter Port
     (British)                                    Limited                                  Guernsey, GY1 4 PW

    Neil J. Crocker                               Managing Director of                     National Westminster House
    A-Director                                    Abacus Financial Services (Guernsey)     Le Truchot, St. Peter Port
    (British)                                     Limited                                  Guernsey, GY1 4 PW

    Wayne Tallowin                                Managing Director of                     National Westminster House
    A-Director                                    Abacus Financial Services (Guernsey)     Le Truchot, St. Peter Port
    (British)                                     Limited                                  Guernsey, GY1 4 PW

    Marc Hollander                                Managing Director of                     World Trade Center
    B-Director                                    Investor Growth Capital Holding B.V.     Tower D, 11th Floor
    (Dutch)                                                                                Strawinskylaan 1159
                                                                                           107XX Amsterdam
                                                                                           The Netherlands

    Catarina Fritz                                Managing Director of                     Arsenalsgatan 8c
    B-Director                                    Investor AB                              S-103 32 Stockholm
    (Swedish)                                                                              Sweden


     To the best of the Reporting Persons' knowledge:

          (a) None of the above persons hold any Shares.

          (b) None of the above persons has any contracts, arrangements, understandings or relationships with respect to
the Shares.




                                                                                                            Page 9 of 15

                                                 ANNEX B

                                  Directors and Officers of Investor AB


Name/Title/Citizenship         Principal Occupation                                  Business Address
----------------------         --------------------                                  ----------------
                                                                               
Percy Barnevik                 Chairman                                              Investor AB
Director                       Chairman of ABB Ltd., AstraZeneca PLC                 Arsenalsgatan 8c
(Swedish)                      and Sandvik; Director of General Motors, (USA)        S-103 32
                                                                                     Stockholm, Sweden

Claes Dahlback                 Executive Vice Chairman                               Investor AB
Director                       Chairman of EQT, Gambro AB, IBX, imGO,                Arsenalsgatan 8c
(Swedish)                      Stora Enso Oyj and Vin & Spirit AB;                   S-103 32
                               Vice Chairman of SEB;                                 Stockholm, Sweden
                               Director of Findus

Jacob Wallenberg               Executive Vice Chairman                               Investor AB
Director                       Chairman of SEB; Vice Chairman of Atlas Copco AB,     Arsenalsgatan 8c
(Swedish)                      Electrolux AB and the Knut and Alice Wallenberg       S-103 32
                               Foundation; Director of ABB Ltd., WM-data, the        Stockholm, Sweden
                               Swedish Federation of Industries, the Nobel
                               Foundation and EQT Scandinavia B.V.

Marcus Wallenberg              President and Chief Executive Officer                 Investor AB
Director                       Vice Chairman of Telefonaktiebolaget LM Ericsson      Arsenalsgatan 8c
(Swedish)                      and Saab AB;                                          S-103 32
                               Director of AstraZeneca PLC,                          Stockholm, Sweden
                               the Knut and Alice Wallenberg Foundation, SAS
                               Assembly of Representatives, Stora Enso Oyj and
                               Scania AB

Hakan Mogren                   Deputy Chairman of AstraZeneca PLC and Gambro AB;     Investor AB
Director                       Forthcoming Chairman of Reckitt Benckiser PLC and     Arsenalsgatan 8c
(Swedish)                      Chairman of the Industrial Institute for Industrial   S-103 32
                               and Social Research (IUI), the Swedish-American       Stockholm, Sweden
                               Foundation and the Swedish-Japanese Foundation;
                               Director of the Carl Trygger Foundation for
                               Scientific Research, Marianne and Marcus
                               Wallenberg's Foundation and the Royal Academy of
                               Engineering Sciences (IVA)

                                                                                                           Page 10 of 15

Name/Title/Citizenship         Principal Occupation                                  Business Address
----------------------         --------------------                                  ----------------

Mauritz Sahlin                 Chairman of Air Liquide AB, FlexLink Systems AB,      Investor AB
Director                       Imego, Universum AB and the Western Sweden Chamber    Arsenalsgatan 8c
(Swedish)                      of Commerce;                                          S-103 32
                               Director of Chalmers AB, Billes AB, Netmage AB,       Stockholm, Sweden
                               Paybox Nordic AG, Sandvik AB and the Federation of
                               Swedish Industries

Anders Scharp                  Chairman of AB Nederman, Atlas Copco, Saab AB, SKF    Investor AB
Director                       and the Swedish Employer's Confederation; Director    Arsenalsgatan 8c
(Swedish)                      of Federation of Swedish Industries                   S-103 32
                                                                                     Stockholm, Sweden

Peter D. Sutherland            Chairman of Goldman Sachs International and BP        Investor AB
Director                       Amoco p.l.c.; Director of ABB Ltd.,                   Arsenalsgatan 8c
(Irish)                        The Royal Bank of Scotland Group p.l.c. and           S-103 32
                               Telefonaktiebolaget LM Ericsson                       Stockholm, Sweden

Bjorn Svedberg                 Chairman of Eniro, Hi3G Access, K-World, Nefab,       Investor AB
Director                       Pyrosequencing, RKI (Denmark), Salcomp (Finland),     Arsenalsgatan 8c
(Swedish)                      Chalmers University of Technology and the Royal       S-103 32
                               Academy of Engineering Sciences (IVA);                Stockholm, Sweden
                               Director of Saab AB, the Knut and Alice Wallenberg
                               Foundation, Gambro, the Financial Supervisory
                               Authority and the Morgan Stanley Dean Witter
                               European Advisory Board

Michael Treschow               President and CEO of AB Electrolux;                   Investor AB
Director                       Chairman of the Swedish Trade Council;                Arsenalsgatan 8c
(Swedish)                      Director of Atlas Copco and the Center for Business   S-103 32
                               and Policy Studies                                    Stockholm, Sweden

Peter Wallenberg               Honorary Chairman                                     Investor AB
Director                       Chairman of the Knut and Alice Wallenberg             Arsenalsgatan 8c
(Swedish)                      Foundation; Honorary Chairman of Atlas Copco          S-103 32
                                                                                     Stockholm, Sweden

                                                                                                           Page 11 of 15


Name/Title/Citizenship         Principal Occupation                                  Business Address
----------------------         --------------------                                  ----------------

Borje Ekholm                   Executive Vice President,                             Investor Growth Capital, Inc.
Executive Vice President       New Investments, New York                             12 East 49th Street
(Swedish)                                                                            New York, N.Y. 10017

Lars Wedenborn                 Chief Financial Officer                               Investor AB
Chief Financial Officer &      and Executive Vice President                          Arsenalsgatan 8c
Executive Vice President                                                             S-103 32
(Swedish)                                                                            Stockholm, Sweden

Sven Nyman                     Executive Vice President                              Investor AB
Executive Vice President       Core Holdings                                         Arsenalsgatan 8c
(Swedish)                                                                            S-103 32
                                                                                     Stockholm, Sweden

         To the best of the Reporting Persons' knowledge:

                  (a)      None of the above persons hold any Shares.

                  (b)      None  of  the  above  persons  has  any  contracts,   arrangements,   understandings  or
relationships with respect to the Shares.





                                                                   Page 12 of 15

                                  EXHIBIT INDEX
                                                                        Page No.
                                                                        --------

A.             Joint Filing  Agreement,  dated as of June 1, 2001,  by
               and between  Investor AB and  Investor  Growth  Capital
               Limited................................................     13

B.             Power of Attorney,  dated December 13, 2000, granted by
               Investor AB in favor of Borje  Ekholm,  Henry Gooss and
               Michael Oporto.........................................     14

C.             Power of Attorney,  dated February 20, 2001, granted by
               Investor  Growth  Capital  Limited  in  favor  of Borje
               Ekholm, Henry Gooss and Michael Oporto.................     15