1. Department of Applied Prosthodontics, Nagasaki University Graduate School of Biomedical Sciences
2. Department of Oral Pathology and Bone Metabolism, Nagasaki University Graduate School of Biomedical Sciences
3. Department of Histology and Cell Biology, Nagasaki University Graduate School of Biomedical Sciences
4. Present address: Division of Histochemistry and Cell Biology, Department of Anatomy, Faculty of Medicine, University of Miyazaki
5. Central Electron Microscope Laboratory, Nagasaki University Graduate School of Biomedical Sciences
6. Department of Cell Biology, Nagasaki University Graduate School of Biomedical Sciences
7. Department of Cell Biology, National Cerebral and Cardiovascular Center Research Institute