1. Veterinary Anatomy, Department of Veterinary Science, Faculty of Agriculture, Tottori University, 4-101 Koyama Minami, Tottori 680-8553, Japan
2. Laboratory of Basic Veterinary Science, United Graduate School of Veterinary Science, Yamaguchi University, 1677-1 Yoshida, Yamaguchi 753-8515, Japan
3. Veterinary Physiology, Department of Veterinary Science, Faculty of Agriculture, Tottori University, 4-101 Koyama Minami, Tottori 680-8553, Japan