1. Laboratory of Gene Analysis, Department of Viral Oncology, Institute for Virus Research,1
2. Department of Pathology, School of Medicine, Fujita Health University, Toyoake 470-1192,2 Japan
3. Department of Pathology and Biology of Diseases, Graduate School of Medicine,3 and
4. Institute for Frontier Medical Science,4 Kyoto University, Sakyo-ku, Kyoto 606-8507, and