1. Laboratory of Animal Reproduction, Faculty of Agriculture, Kagoshima University, Kagoshima, Japan.
2. Department of Hygiene and Health Promotion Medicine, Graduate School of Medical and Dental Sciences, Kagoshima University, Kagoshima, Japan.
3. Section of Gene Expression Regulation, Center for Advanced Biomedical Science and Swine Research, Kagoshima University, Kagoshima, Japan.
4. Department of Veterinary Histopathology, Joint Faculty of Veterinary Medicine, Kagoshima University, Kagoshima, Japan.
5. Laboratory of Theriogenology, Faculty of Veterinary Medicine, Azabu University, Kanagawa, Japan.
6. Department of Pathology, Graduate School of Medical and Dental Sciences, Kagoshima University, Kagoshima, Japan.