1. Department of Agrobiology; Faculty of Agriculture; Niigata University; Nishi-ku Niigata 950-2181 Japan
2. The Key Laboratory for Mammalian Reproductive Biology and Biotechnology; Ministry of Education; Inner Mongolia University; Hohhot 010021 China
3. Department of Nutritional Sciences for Well-Being; Faculty of Health Sciences for Welfare; Kansai University of Welfare Sciences; Kashiwara Osaka 582-0026 Japan
4. Central Pharmaceutical Research Institute; Japan Tobacco, Inc.; Takatsuki Osaka 569-1125 Japan
5. Department of Life Science; Division of Natural Sciences; International Christian University; Mitaka Tokyo 181-8585 Japan