1. 1Section of Molecular Neurobiology, Graduate School, Tokyo Medical and Dental University, 1-5-45 Yushima, Bunkyo-ku, Tokyo 113-8549, Japan
2. 2Section of Oral Neuroscience, Graduate School of Dental Sciences, Kyushu University, 3-1-1 Maidashi, Higashi-ku, Fukuoka 812-8582, Japan
3. 3Department of Chemistry, Asahi University School of Dentistry, 1851-1 Hozumi, Motosu-gun, Gifu 501-0296, Japan
4. 4Department of Anatomy (Division II), School of Dental Medicine, Tsurumi University, 2-1-3 Tsurumi, Tsurumi-ku, Yokohama 230-8501, Japan