1. Laboratory of Molecular Genetics for Reproduction, National Institute for Basic Biology, Okazaki 444-8787, Japan.
2. Department of Basic Biology, the Graduate University for Advanced Studies (SOKENDAI), Okazaki, Aichi 444-8585, Japan.
3. National Institutes of Natural Sciences, Okazaki Institute for Integrative Bioscience, National Institute for Physiological Sciences, Okazaki, Aichi 444-8787, Japan.
4. Department of Physiological Sciences, the Graduate University for Advanced Studies (SOKENDAI), Okazaki, Aichi 444-8585, Japan.