1. Department of Pharmacology, Oita University Faculty of Medicine, 1-1 Idaigaoka, Hasama, Yufu, Oita 879-5593, Japan
2. Division of Molecular Metabolism and Diabetes, Tohoku University Graduate School of Medicine, 2-1 Seiryo, Aoba, Sendai, Miyagi 980-8575, Japan
3. Department of Anatomy I, Fujita Health University School of Medicine, Toyoake, Aichi 470-1192, Japan
4. Protein Research Network, Inc., 1-13-5 Fukuura, Kanazawa-ku, Yokohama 236-0004, Japan