POWER OF ATTORNEY

	KNOW ALL MEN BY THESE PRESENTS, that the person whose signature appears
below hereby constitutes and appoints F. Paul Broyer, Darrell Simino, Robert E. Quinn,
Gordon H. Hayes, Jr., Cynthia J. Q. Rumsey, Thomas H. Redekopp, Marianne L. Kotubetey,
Peter F. Durning, Elizabeth R. Cerda, and Anne W. French, and any one of them acting singly,
the true and lawful attorneys-in-fact and agents, with full power of substitution and
re-substitution, for the undersigned and in the undersigned's name, place and stead, in any and all
capacities (until revoked in writing) to sign any and all instruments, certificates and documents
required to be executed on behalf of the undersigned as an individual or on behalf of the
undersigned holding company, as the case may be, pursuant to sections 13 and 16 of the
Securities Exchange Act of 1934, as amended (the "Exchange Act"), and any and all regulations
promulgated thereunder, and to file the same, with all exhibits thereto, and any other documents
in connection therewith, with the Securities and Exchange Commission, and with any other
entity when and if such is mandated by the Exchange Act or by the By-laws of the National
Association of Securities Dealers, granting unto said attorneys-in-fact and agents full power and
authority to do and perform each and every act and thing requisite and necessary fully to all
intents and purposes as the undersigned might or could do in person thereby ratifying and
confirming all that said attorneys-in-fact and agents, or their substitute or substitutes, may
lawfully do or cause to be done by virtue hereof.

	IN WITNESS WHEREOF, this Power of Attorney has been signed as of 11/5/2003.


Signature: /s/ Kathleen McMillan

Name: Kathleen McMillan








BS91814.1