1. Department of Veterinary Pathology, Faculty of Agriculture, Tottori University, Tottori 680-8553, Japan
2. Division of Neuropathology, Institute of Neurological Sciences, Faculty of Medicine, Tottori University, Yonago 683-0826, Japan
3. Laboratory of Comparative Pathology, Graduate School of Veterinary Medicine, Hokkaido University, Sapporo 060-0818, Japan
4. Division of Radiotoxicology and Protection, National Institute of Radiological Sciences, Inageku, Chiba 263-0024, Japan