Affiliation: | Department of Microbiology1. and Department of Immunotherapeutics,2. Medical Research Division, and Human Gene Science Center,4. Tokyo Medical and Dental University, Yushima, Bunkyo-ku, Tokyo 113, Department of Biosciences, School of Science, Kitasato University, Kitasato 1-15-1, Sagamihara, Kanagawa 228,3. and Department of Virology, Niigata University School of Medicine, Asahimachi-Dori, Niigata 951-8510,5. Japan |