1. Department of Biochemistry, School of Dentistry, Tokyo Medical and Dental University, 5-45, Yushima 1-Chome, Bunkyo-ku, Tokyo 113, Japan
2. 1st Department of Oral Surgery, School of Dentistry, Tokyo Medical and Dental University, 5-45, Yushima 1-Chome, Bunkyo-ku, Tokyo 113, Japan