1. Quality Assurance Division, Nagase ChemteX Corporation, 1-58-1, Osadano-cho, Fukuchiyama, Kyoto 620-0853, Japan
2. Department of Microbiology, Kyoto Pharmaceutical University, Misasagi-Nakauchicho 5, Yamashina, Kyoto 607-8414, Japan
3. Department of Infectious Disease, Division of Medical Microbiology, Kyorin University School of Medicine, 6-20-2 Shinkawa, Mitaka, Tokyo 181-8611, Japan
4. Bio/Fine Chemicals Division, Nagase ChemteX Corporation, 2-2-3 Murotani, Nishi-ku, Kobe, Hyogo 651-2241, Japan