1. Merck and Co. Inc., BioProcess R&D, BioPurification Development Group, P.O. Box 2000, RY805S-100, Rahway, New Jersey 07065, BioResources International, Inc., P.O. Box 6595, Somerset, New Jersey 08875, and Department of Chemical & Biochemical Engineering, Rutgers University, 98 Brett Road, Piscataway, New Jersey 08854-8058