1. Department of Cell Pathology, Graduate School of Medical Sciences, Kumamoto University
2. Department of Hematology, Graduate School of Medical Sciences, Kumamoto University
3. Division of Tumor and Cellular Biochemistry, Department of Medical Sciences, University of Miyazaki
4. Laboratory of Virus Control, Institute for Virus Research, Kyoto University
5. Department of Histology, Graduate School of Medical Sciences, Kumamoto University