Exhibit 23.1
CONSENT OF INDEPENDENT CERTIFIED PUBLIC ACCOUNTANTS
We have issued our report dated February 10, 2000, accompanying the consolidated
financial statements of Empyrean Bioscience, Inc. as of December 31, 1999 and
1998 and for the years then ended, contained in Amendment No. 6 to the
Registration Statement (Form S-4, No. 333-84147) and Joint Proxy
Statement/Prospectus. We consent to the use of the aforementioned report in this
Registration Statement and Joint Proxy Statement/Prospectus, and to the use of
our name as it appears under the caption "Experts."
/s/ Grant Thornton LLP
San Jose, California
January 17, 2001
