1. Laboratory of Veterinary Biochemistry, Faculty of Agriculture, Tottori University, Japan
2. Laboratory of Veterinary Anatomy, Faculty of Agriculture, Tottori University, Japan
3. Laboratory of Laboratory Animal Science, Faculty of Agriculture, Tottori University, Tottori 680-8553, Japan
4. Laboratory of Histology and Cytology, Department of Functional Morphology, Graduate school of Medicine, Hokkaido University, Sapporo, Hokkaido 060-8638, Japan