1. Graduate School of Science and Engineering Saitama University 255 Shimo-Okubo, Sakura-ku Saitama 338-8570 Japan
2. Chemistry and Biochemistry Swarthmore College Swarthmore PA 19081 USA
3. Department of Life Sciences Graduate School of Arts and Sciences The University of Tokyo 3-8-1 Komaba, Meguro-ku Tokyo 153-8902 Japan