1. Department of Oral Anatomy, School of Dentistry, Aichi-Gakuin University, Nagoya, Aichi, Japan
2. Division of Bio-resources, Department of Biotechnology, Frontier Science Research Center, University of Miyazaki, 5200 Kihara, Kiyotake, Miyazaki, Japan
3. Department of Zoology, Faculty of Science, Okayama University of Science, Ridai-cho, Okayama, Japan