1. Division of Immunology; Kyushu University of Health and Welfare, Faculty of Health and Science; Nobeoka Miyazaki 882-8508 Japan
2. Department of Immunology; Kurume University School of Medicine; Kurume Fukuoka 830-0011 Japan
3. Department of Molecular Life Science; Tokai University School of Medicine; Isehara Kanagawa 259-1193 Japan