1. Laboratory of Animal Reproduction, Ishikawa Prefectural University, Ishikawa 921-8836, Japan
2. Center for Fetal DNA Diagnosis from Maternal Blood, Kanazawa Medical University, Ishikawa 920-0293, Japan
3. Department of Developmental Biology, Osaka Bioscience Institute, Osaka 565-0874, Japan
4. Present: Unité Mixte de Recherche 1019, Unité de Nutrition Humaine, Institut National de la Recherche Agronomique, Centre de Recherche de Clermont-Ferrand/Theix, 63122 Saint Genès Champanelle, France
5. NARO Institute of Livestock and Grassland Science, Ibaraki 305-0901, Japan