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KOICHI NIWA
Laboratory of Physiology, Department of Biomedical Sciences, Graduate School of Veterinary Medicine, Hokkaido University, Sapporo 060, Japan
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HIROYOSHI HORIKOSHI
Pharmacology and Molecular Biology Research Laboratories, Sankyo, Tokyo 140, Japan
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TOMIO KANNO
Laboratory of Physiology, Department of Biomedical Sciences, Graduate School of Veterinary Medicine, Hokkaido University, Sapporo 060, Japan