X0202 4 2006-02-24 0 0001103390 INTRABIOTICS PHARMACEUTICALS INC /DE IBPI 0001307726 Baker Biotech Capital II (Z) (GP), LLC 667 MADISON AVENUE 17TH FLOOR NEW YORK NY 10021 0 0 1 0 0001087939 BAKER JULIAN 667 MADISON AVENUE NEW YORK NY 10021 0 0 1 0 0001087940 BAKER FELIX 667 MADISON AVENUE NEW YORK NY 10021 0 0 1 0 Common Stock 2006-02-24 4 P 0 1787 3.350 A 56491 I See Footnote In addition to Baker Biotech Capital II (Z) (GP), LLC, this Form 4 is being filed jointly by Julian C. Baker and Felix J. Baker, each of whom has the same business address as Baker Biotech Capital II (Z) (GP), LLC and may be deemed to have a pecuniary interest in securities owned by it. Because of certain relationships with other security holders of the Issuer, the Reporting Persons are filing solely for informational purposes as if they were members of a group with such security holders. However, the Reporting Persons disclaim that they and any other person or persons in fact constitute a "group" for purposes of Section 13(d)(3) of the Securities Exchange Act of 1934, as amended, or Rule 13d-5 thereunder or that they are the beneficial owners of securities owned by any such other persons, and each of them disclaims beneficial ownership of securities reported herein except to the extent of their pecuniary interest, if any, therein. Represents shares of common stock owned directly by Baker Biotech Fund II (Z), L.P., a limited partnership of which the sole general partner is Baker Biotech Capital II (Z), L.P., a limited partnership of which the sole general partner is Baker Biotech Capital II (Z) (GP), LLC. Felix J. Baker and Julian C. Baker are the controlling members of Baker Biotech Capital II (Z) (GP), LLC. /s/ Julian C. Baker, as Managing Member of Baker Biotech Capital II (Z) (GP), LLC 2006-02-28 /s/ Julian C. Baker 2006-02-28 /s/ Felix J. Baker 2006-02-28