1. Departments of Oral Pathology (K.K., Y.G., S.Y., H.K., T.Y., A.Y.), School of Dentistry, Showa University, Tokyo 142, Japan
2. Department of Orthopedic Surgery (K.K., H.N.), Kagawa Medical School, Kagawa 761–07, Japan
3. Department of Orthopedic Surgery (T.N.), School of Medicine, University of Occupational and Environmental Health, Fukuoka 807, Japan
4. Biochemistry (T.S.), School of Dentistry, Showa University, Tokyo 142, Japan
5. Institute for Molecular and Cellular Biology (K.Y., T.T.), Osaka University, Osaka 565, Japan
6. Department of Medicine III (T.K.), Osaka University Medical School, Osaka 565, Japan
7. Department of Orthopedic Surgery (T.Y.), Juntendo University School of Medicine, Tokyo, Japan