1. Laboratory of Pathophysiology; Graduate School of Pharmaceutical Sciences; Kyushu University; Fukuoka 812-8582; Japan
2. Department of Oral Anatomy and Cell Biology; Graduate School of Dental Science; Kyushu University; Fukuoka 812-8582; Japan
3. Discovery Research Laboratories; Minase Research Institute; Ono Pharmaceutical Co., Ltd.; 3-1-1 Sakurai, Shimamoto-cho, Mishima-gun; Osaka; 618-8585; Japan
4. Division of Homeostatic Development; Department of Developmental Physiology; National Institute for Physiological Sciences; Okazaki; 444-8787; Japan
5. Max Planck Institute for Medical Research; Department of Molecular Neurobiology; Jahnstrasse 29, D-69120; Heidelberg; Germany