1. Department of Molecular Biology, Graduate School of Medical Science, Kyushu University, Fukuoka 812-8582, Japan
2. Oral and Maxillofacial Surgery Advanced Course, Division of Dental Science, Graduate School, Kyushu University, Fukuoka 812-8582, Japan
3. Department of Pathology and Cell Biology Program, Case Western Reserve University School of Medicine, Cleveland, Ohio 44106-2622