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S. SEKITA
National Institute of Hygienic Sciences
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K. YOSHIHIRA
National Institute of Hygienic Sciences
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S. NATORI
National Institute of Hygienic Sciences
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S. UDAGAWA
National Institute of Hygienic Sciences
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T. MUROI
National Institute of Hygienic Sciences
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H. KURATA
National Institute of Hygienic Sciences
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M. UMEDA
Tissure Culture Laboratory, Yokohama City University School of Medicine