1. Departments of Developmental and Reproductive Biotechnology, Azabu University School of Veterinary Medicine, Fuchinobe, Sagamihara-shi, Kanagawa 229-8501, Japan
2. Department of Anatomy II, Azabu University School of Veterinary Medicine, Fuchinobe, Sagamihara-shi, Kanagawa 229-8501, Japan
3. Department of Surgery II, zabu University School of Veterinary Medicine, Fuchinobe, Sagamihara-shi, Kanagawa 229-8501, Japan
4. Comparative Toxicology, Azabu University School of Veterinary Medicine, Fuchinobe, Sagamihara-shi, Kanagawa 229-8501, Japan