1. Department of Biochemistry and Molecular Dentistry (T.N., T.N., T.S., M.T.), Okayama University Dental School, Okayama 700-8525
2. Biodental Research Center (T.N., T.N., M.T.), Okayama University Dental School, Okayama 700-8525
3. Microbiology (K.K.), Kyoto Prefectural University of Medicine, Kyoto 602-8566
4. Departments of Orthopedic Surgery (T.K.), Kyoto Prefectural University of Medicine, Kyoto 602-8566
5. and Pharmaceutical Frontier Research Laboratories, Japan Tobacco, Inc. (T.T., K.T.), Yokohama 236-0004, Japan