1. Department of Biochemistry, Osaka University Faculty of Dentistry, Osaka, Japan
2. The First Department of Oral and Maxillofacial Surgery, Osaka University Faculty of Dentistry, Osaka, Japan
3. Department of Oral Anatomy and Developmental Biology, Osaka University Faculty of Dentistry, Osaka, Japan
4. Department of Oral Pathology, School of Dentistry, Nagasaki University, Nagasaki, Japan
5. Department of Molecular Biology, Kawasaki Medical School, Kurashiki, Japan
6. Department of Biological Science and Technology, Faculty of Engineering, University of Tokushima, Tokushima, Japan
7. Department of Anatomy and Histology, School of Dental Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, U.S.A.