1. Central Research
Laboratories, Seikagaku Corporation, 1253, Tateno 3-chome, Higashiyamato-shi, Tokyo 207-0021, Japan
2. Department
of Biosciences and Informatics, Faculty of Science and Technology, Keio University, 3-14-1 Hiyoshi, Kohokuku, Yokohama, Kanagawa 223-8522, Japan