ABI/Advanced Biotechnologies Inc. American Bioanalytical Inc. American Synthesis Inc. BCCM BioWhittaker Inc. Boehringer Mannheim GmbH Calbiochem/Novabiochem International Celox Laboratories Inc. Clontech Laboratories Inc. Crescent Chemical Co. Inc. CSL Biosciences Difco Laboratories Gibco BRL Div. of Life Technologies Inc. ICN Biochemicals Inc. Invitrogen Corp. Irvine Scientific Inc. JRH Biosciences Molecular Probes Inc. New Brunswick Scientific Co. Inc. Quality Biological Inc. Serva/Crescent Chemical Co. Inc. Sigma Chemical Co. Spectrum Chemical Mfg. Corp. Stratagene GmbH United States Biochemical Corp. Wako BioProducts