1. Laboratory of Biochemistry Department of Biomedical Sciences Graduate School of Veterinary Medicine Hokkaido University Sapporo 060‐0818 Japan
2. Department of Neuroscience II Research Institute of Environmental Medicine Nagoya University Nagoya 464‐8601 Japan
3. Department of Neural Regulation Nagoya University Graduate School of Medicine Nagoya 466‐8550 Japan
4. JSPS Research Fellowship for Young Scientists Tokyo 102‐0083 Japan
5. Division of Metabolic Medicine Research Center for Advanced Science and Technology The University of Tokyo Tokyo 153‐8904 Japan
6. Division of Endocrinology and Metabolism National Institute for Physiological Sciences National Institutes of Natural Sciences Okazaki 444‐8585 Japan
7. Department of Physiological Sciences School of Life Science SOKENDAI (The Graduate University for Advanced Studies) Okazaki 444‐8585 Japan
8. Department of Biology School of Biological Sciences Tokai University Sapporo 005‐8601 Japan