Affiliation: | 1. Laboratory of Reproductive Biology, National Institute for Basic Biology, Okazaki, Japan 2. Dept. Biosci., Fac. Biosci., Nagahama Inst. Bio-Sci. Tech., Nagahama, Japan 3. CREST, Kawaguchi, Saitama, Japan 4. Sado Marine Biol. Stat., Fac. Sci., Niigata Univ., Niigata, Japan
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