1. Intestinal Flora Laboratory, Calpis Food Industry Co. Ltd, 11–10, 5-chome, Fuchinobe, Sagamihara, Kanagawa, 229, Japan
2. Department of Pharmacology, Hamamatsu University School of Medicine, Handa machi, 3600, Hamamatsu, Shizuoka, 431-31, Japan
3. Institute of Anaerobic Bacteriology, School of Medicine, University of Gifu, Tsukasa machi 40, Gifu, 500, Japan