Affiliation: | 1. Department of Applied Chemistry, Faculty of Science and Technology, Keio University, 3‐14‐1 Hiyoshi, Kohoku‐ku, Yokohama 223‐8522 (Japan), Fax: (+81)?45‐566‐1576;2. Department of Bioscience and Informatics, Faculty of Science and Technology, Keio University, 3‐14‐1 Hiyoshi, Kohoku‐ku, Yokohama 223‐8522 (Japan) |