1. Laboratory of Veterinary Anatomy Department of Veterinary Medicine School of Veterinary Medicine Rakuno Gakuen University Ebetsu Hokkaido Japan
2. Laboratory of Anatomy Department of Basic Veterinary Science Faculty of Veterinary Medicine Hokkaido University Sapporo Hokkaido Japan
3. Laboratory of Agrobiomedical Science Faculty of Agriculture Hokkaido University Sapporo Hokkaido Japan
4. Section of Biological Safety Research Chitose Laboratory Japan Food Research Laboratories Chitose Hokkaido Japan
5. Department of Histology and Cytology Faculty of Veterinary Medicine Zagazig University Zagazig Egypt