1. Department of Veterinary Microanatomy, School of Veterinary Medicine, Rakuno Gakuen University, Ebetsu, Hokkaido 069–8501, Japan
2. Nippi Research Institute of Biomatrix and Protein Engineering Project, Toride, Ibaraki 302–0017, Japan
3. The Maple Foundation, Chuou-ku, Tokyo 103–0014, Japan
4. RIKEN Center for Integrative Medical Sciences, Yokohama, Kanagawa 230–0045, Japan
5. Division of Pathology, Department of Oral Diagnostic Sciences, Showa University School of Dentistry, Shinagawa, Tokyo 142–8555, Japan
6. Molecular and Cellular Physiology, Faculty of Pharmaceutical Sciences, Tokushima Bunri University, Tokushima 770–8055, Japan