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*akio ishikawa
division of life science, graduate school of agriculture, meiji university
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takao shusa
division of life science, graduate school of agriculture, meiji university special researcher of japan society for the promotion of science
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takako katou
institute of reproduction and endocrinology, meiji university
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yukio katou
division of life science, graduate school of agriculture, meiji university department of life science, school of agriculture, meiji university institute of reproduction and endocrinology, meiji university