1. United Graduate School of Veterinary Sciences, Gifu University, 1–1 Yanagido, Gifu 501–1193, Japan
2. Laboratory of Veterinary Anatomy, Faculty of Agriculture, Iwate University, 3–18–8 Ueda, Morioka, Iwate 020–8550, Japan
3. United Graduate School of Agricultural Sciences, Iwate University, 3–18–8 Ueda, Morioka, Iwate 020–8550, Japan
4. Department of Chemistry and Bioengineering, Faculty of Engineering, Iwate University, 3–18–8 Ueda, Morioka, Iwate 020–8550, Japan