1. Department of Biochemistry, School of Pharmaceutical Sciences, University of Shizuoka, Yada, Shizuoka-shi 422-8526,1
2. Department of Veterinary Public Health, Faculty of Agriculture, Tottori University, Tottori 680-8553,2
3. Department of Veterinary Science, Gluck Equine Research Center, University of Kentucky, Lexington, Kentucky 405463; and
4. Department of Applied Bioorganic Chemistry, Gifu University, Gifu 501-1193,4 and
5. Institute of Medical Science, University of Tokyo, Minato-ku, Tokyo 108-8639,6 Japan;
6. Department of Pathobiological Sciences, School of Veterinary Medicine, University of Wisconsin-Madison, Madison, Wisconsin 537065