Affiliation: | 1Hamanaka Branch of the Kushiro District Agricultural Mutual Aid Association, 85 Midori, Chanai, Hamanaka, Akkeshi, Hokkaido 080-1592, Japan.;2Department of Neuroscience and Cell Biology, University of Texas Medical Branch, 301 University Boulevard, Galveston, TX 77555-1069, USA.;3Department of Veterinary Surgery, College of Veterinary Medicine, Seoul National University, Seoul 151-742, Korea. |