GENZYME CORP - FORM 10-K/A - EX-31.3

file	filename
10-K/A - FORM 10-K/A - GENZYME CORP	b85665e10vkza.htm
EX-31.4 - EX-31.4 - GENZYME CORP	b85665exv31w4.htm

EXHIBIT 31.3

Certification Pursuant To
Rules 13a-14(a) And 15d-14(a) Under The Securities Exchange Act Of 1934, As Amended

I, Henri A. Termeer, certify that:

1.		I have reviewed this annual report on Form 10-K/A of Genzyme Corporation (the “Registrant”); and

2.		Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report.

GENZYME CORP - FORM 10-K/A - EX-31.3 - March 24, 2011