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Katsunori OKAZAKI
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Kiyotaka NAKATSU
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Eiichi HONDA
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Tetsuo KUMAGAI
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Author's Organization:Department of Veterinary Medicine, Faculty of Agriculture, Tokyo University of Agriculture and Technology Department of Veterinary Medicine, Faculty of Agriculture, Tokyo University of Agriculture and Technology Department of Veterinary Medicine, Faculty of Agriculture, Tokyo University of Agriculture and Technology Department of Veterinary Medicine, Faculty of Agriculture, Tokyo University of Agriculture and Technology