1. Department of Bioinformatics; Soka University; 1-236 Tangi-cho Hachioji Tokyo 192-8577 Japan
2. Japan Synchrotron Radiation Research Institute; Sayo Hyogo 679-5198 Japan
3. Department of Physics; Kansai Medical University; 18-89 Uyama-Higashi Hirakata 573-1136 Japan