1. Institute for Oral Science (X.L., N.T.), Matsumoto Dental University, Nagano 399-0781, Japan
2. the Department of Biochemistry (N.U.), Matsumoto Dental University, Nagano 399-0781, Japan
3. the Department of Biochemistry (K.I., K.S.), School of Dentistry, Showa University, Tokyo 142-8555, Japan
4. the Department of Periodontology (Y.M.), Aichi Gakuin University, Nagoya 464-8651, Japan
5. the Department of Oral Microbiology (T.N.), Kyushu Dental College, Fukuoka 803-8580, Japan
6. the Research Center for Genomic Medicine (T.S.), Saitama Medical School, Saitama 350-1241, Japan