Affiliation: | From the ‡Graduate School of Environmental and Life Science and ;‖Graduate School of Natural Science and Technology, Okayama University, 1-1-1, Tsushima-naka, Okayama 700-8530, Japan.;the §Division of Animal Science, National Institute of Agrobiological Sciences, Tsukuba Ibaraki 905-8602, Japan.;¶RIKEN Bioresource Center, Tsukuba, Ibaraki 305-0074, Japan, and ;**The Jackson Laboratory, Bar Harbor, Maine 04609 |