1. From the Division of Immunology, Institute for Medical Science, and Department of Pathology, Dokkyo University School of Medicine, Tochigi, Japan; Research Center of Fundamental Medicine, International University of Health and Welfare, Tochigi, Japan; Department of Human Genetics, Graduate School of Medicine, the University of Tokyo, Japan; Department of Molecular Immunology, Tokyo Medical and Dental University, Japan; and Department of Immunology, Juntendo University School of Medicine, Tokyo, Japan.