Author information:
(1)Division for Animal Research Resources, Institute of Health Biosciences, The 
University of Tokushima Graduate School, Tokushima 770-8503, Japan.
(2)Laboratory of Veterinary Biochemistry, School of Veterinary Medicine, 
Kitasato University, Aomori 034-8628, Japan.
(3)Department of Biological Resources, Integrated Centre for Science, Ehime 
University, Shitsukawa, Toon City, Ehime 791-0295, Japan.
(4)Institute for Genetic Medicine, Hokkaido University, Sapporo 060-0815, Japan.
(5)Department of Veterinary Physiology, Faculty of Agriculture, Iwate 
University, Morioka 020-8550, Japan; United Graduate School of Veterinary 
Science, Gifu University, Yanagido, 1-1, Gifu 501-1193, Japan.
(6)Institute for Genetic Medicine, Hokkaido University, Sapporo 060-0815, Japan. 
Electronic address: mmorimat@igm.hokudai.ac.jp.