Exhibit 23.5


                       CONSENT OF INDEPENDENT ACCOUNTANTS

We consent to the incorporation by reference in this Registration Statement on
Form S-4 of Genzyme Corporation of our report dated February 22, 2000, relating
to the financial statements of RenaGel LLC, which appears in GelTex
Pharmaceuticals, Inc.'s Annual Report on Form 10-K for the year ended
December 31, 1999.

/s/ PricewaterhouseCoopers LLP

Boston, Massachusetts
May 18, 2001