1. Laboratory of Animal Molecular Morphology, Department of Animal Science, Graduate School of Agricultural Science, Kobe University, Hyogo, Japan
2. Laboratory of Histophysiology, Department of Animal Science, Graduate School of Agricultural Science, Kobe University, Hyogo, Japan
3. Faculty of Pharmaceutical Sciences, University of Toyama, Toyama, Japan
4. Laboratory of Toxicology, Department of Environmental Veterinary Sciences, Faculty of Veterinary Medicine, Hokkaido University, Hokkaido, Japan