1Division of Orthodontics and Dentofacial Orthopedics, Graduate School of Dentistry, Tohoku University, Sendai, Miyagi 980-0875, Japan
2Laboratory of Cellular Differentiation, Institute for Frontier Life and Medical Sciences, Kyoto University, Kyoto 606-8507, Japan
3Department of Molecular Biology and Biochemistry, Biomedical Sciences Major, Graduate School of Biomedical & Health Sciences, Hiroshima University, Hiroshima 734-8553, Japan
4Radioisotope Research Institute, Tsurumi University School of Dental Medicine, Tsurumi, Yokohama, 230-8501, Japan
5Department of Biomaterials and Bioengineering, Faculty of Dental Medicine, Hokkaido University, Sapporo, Hokkaido 060-8586, Japan