Corresponding Author

Teppei Nakamura

Laboratory of Anatomy, Department of Basic Veterinary Science, Faculty of Veterinary Medicine, Hokkaido University, Sapporo, Japan

Department of Biological Safety Research, Chitose Laboratory, Japan Food Research Laboratories, Chitose, Japan

These two authors equally contributed to this study.

Correspondence: Teppei Nakamura, DVM, PhD, Laboratory of Anatomy, Department of Basic Veterinary Science, Faculty of Veterinary Medicine, Hokkaido University, Kita 18, Nishi 9, Kita-ku, Sapporo, Hokkaido 060-0818, Japan. Email: nakamurate@vetmed.hokudai.ac.jp