1. Department of PhysiologyCollege of Korean Medicine, Kyung Hee UniversitySeoul02447 Korea
2. Division of Homeostatic DevelopmentNational Institute for Physiological SciencesOkazaki Aichi444‐8585 Japan
3. Department of Physiological SciencesThe Graduate School for Advanced StudyHayama Kanagawa240‐0193 Japan
4. Core Research for Evolutional Science and Technology, Japan Science and Technology Agency Tokyo102‐0076 Japan
5. Department of NeuropharmacologyInterdisciplinary Graduate School of Medicine, University of YamanashiYamanashi409‐3898 Japan