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Hongsheng Lu
Tokyo Univ. of Agric. and Tech.:Ibaraki Univ. College of Agric.
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Yoshinori Sato
Ibaraki Univ. College of Agric.
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Reiko Fujimura
Ibaraki Univ. College of Agric.
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Yoko Katayama
Tokyo Univ. of Agric. and Tech.
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Hiroyuki Ohta
Ibaraki Univ. College of Agric.