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NAOKO OHMURA
Second Department of Internal Medicine, Nippon Medical School, Tokyo 102, Japan
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YOSHIHIRO FUKUO
Second Department of Internal Medicine, Nippon Medical School, Tokyo 102, Japan
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TOSHIO AKIMOTO
Division of Laboratory Animal Science, Nippon Medical School, Tokyo 102, Japan
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HISAMI WATANABE
Department of Immunology, Niigata University School of Medicine, Niigata 951, Japan
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TORU ABO
Department of Immunology, Niigata University School of Medicine, Niigata 951, Japan