Acros Chimica Advanced ChemTech Aldrich Chemical Co. Inc. Amersham Pharmacia Biotech Atomergic Chemetals Corp. BACHEM Feinchemikalien AG Beckman Coulter Corp. Benson Polymeric Inc. Bio-Rad Laboratories Inc. CALBIOCHEM AG Calbiochem/Novabiochem International Crescent Chemical Co. Inc. Curtin Matheson Scientific Inc. Daiichi Pure Chemicals Co. Ltd. Eastern Chemical Div. of United-Guardian Corp. Eurosequence B.V. Fluka Chemie AG GBC Scientific Equipment Pty. Ltd. Gibco BRL Div. of Life Technologies Inc. ICN Biochemicals Inc. Integra Chemical Co. Isotec Inc. JRH Biosciences Mallinckrodt Baker B.V. National Institute of Standards & Technology NBS Biologicals Neosystem S.A. New Brunswick Scientific Co. Inc. Perkin-Elmer Corp. Pierce Chemical Co. Promega Corp. Research Organics Inc. Serva/Crescent Chemical Co. Inc. Sigma Chemical Co. Spectrum Chemical Mfg. Corp. United States Biochemical Corp. Wako BioProducts
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