1. Department of Microbiology and Oral Infection Nagasaki University Graduate School of Biomedical Sciences Nagasaki Nagasaki 852‐8588Japan
2. Institute for Protein Research Osaka University Yamadaoka, Suita Osaka 565‐0871Japan
3. Department of Pediatric Dentistry Nagasaki University Graduate School of Biomedical Sciences Nagasaki Nagasaki 852‐8588Japan
4. Department of Functional Bioscience, Infection Biology Fukuoka Dental College Matsudo, Tamura, Sawara, Fukuoka 814‐0913Japan
5. Department of Physics, Faculty of Science Gakushuin University Toshima‐ku, Tokyo 171‐8588Japan
6. Department of Biochemistry and Molecular Biology Nihon University School of Dentistry at Matsudo Matsudo Chiba 271‐8587Japan