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TOHRU YASUZAWA
Tokyo Research Laboratories, Kyowa Hakko Kogyo Co., Ltd.
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YUTAKA SAITOH
Tokyo Research Laboratories, Kyowa Hakko Kogyo Co., Ltd.
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MICHIO ICHIMURA
Pharmaceutical Research Laboratories, Kyowa Hakko Kogyo Co., Ltd.
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ISAMI TAKAHASHI
Tokyo Research Laboratories, Kyowa Hakko Kogyo Co., Ltd.
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HIROSHI SANO
Tokyo Research Laboratories, Kyowa Hakko Kogyo Co., Ltd. Present address: Shimizu Research Laboratories, Marine Biotechnology Institute Co., Ltd.