1. College of Biological Science and Technology, Beijing Forestry University, Beijing 100083, PR China
2. School of Basic Medical Science, Peking University, Beijing 100083, PR China
3. Laboratory of Veterinary Physiology, Cooperative Department of Veterinary Medicine, Faculty of Agriculture, Tokyo University of Agriculture and Technology, Tokyo 183-8509, Japan
4. Laboratory of Veterinary Physiology, Department of Veterinary Medicine, Faculty of Agriculture, Tokyo University of Agriculture and Technology, Tokyo 183-8509, Japan
5. Department of Basic Science, United Graduate School of Veterinary Sciences, Gifu University, Gifu 501-1193, Japan