1. Laboratory of Laboratory Animal Science and Medicine, School of Veterinary Medicine, Kitasato University
2. Laboratory of Laboratory Animal Science and Medicine, Graduate School of Veterinary Medicine, Hokkaido University
3. Laboratory of Anatomy, Graduate School of Veterinary Medicine, Hokkaido University
4. Department of Veterinary Physiology, School of Veterinary Medicine, Rakuno Gakuen University
5. Section of Biological Safety Research, Chitose Laboratory, Japan Food Research Laboratories