1. Faculty of Veterinary Medicine, Kitasato University School of Veterinary Medicine, Towada, Japan
2. Department of Animal Science, Kitasato University School of Veterinary Medicine, Towada, Japan
3. Laboratory of Genome Science, Biological Genome Resource Center, Institute for Molecular and Cellular Regulation, Gunma University, Maebashi, Japan
4. Department of Microbiology and Immunology, Keio University School of Medicine, Tokyo, Japan
5. Faculty of Bio-Science, Nagahama Institute of Bio-Science and Technology, Nagahama, Japan