Affiliation: | 1. Department of Bacteriology, The Kitasato Institute, Shirokane, Tokyo 108, Japan.;2. Department of Cell Chemistry, The Institute of Medical Science, University of Tokyo, Shirokanedai, Tokyo 108, Japan.;3. Department of Bacteriology, Ehime University School of Medicine, Onsengun, Ehime-ken 791, Japan.;4. Virology Division, National Cancer Center Research Institute, Tsukiji, Tokyo 104, Japan. |