EXHIBIT 23.3

               CONSENT OF ERNST & YOUNG LLP, INDEPENDENT AUDITORS

We consent to the incorporation by reference in the Registration Statement
(Form S-8) pertaining to the registration of 158,868 shares of Genzyme
General Division common stock of our report dated February 22, 2000, with
respect to the consolidated financial statements of GelTex Pharmaceuticals,
Inc. included in its Annual Report (Form 10-K) for the year ended December
31, 1999, filed with the Securities and Exchange Commission.

                                              /s/ Ernst & Young LLP

Boston, Massachusetts
September 26, 2001