1. Laboratory of Molecular Endocrinology, School of Fisheries Sciences, Kitasato University (H.K., T.Y., S.M., K.Y., A.T.), Sanriku, Iwate 022-0101, Japan
2. Sado Marine Biological Station, Faculty of Science, Niigata University (N.M.), Sado, Niigata 952-2135, Japan
3. Division of Life Sciences, University of Toronto at Scarborough (J.Y.), Toronto, Ontario, Canada M1C 1A4
4. Department of Biochemistry and Molecular Biology, University of New Hampshire (S.A.S.), Durham, New Hampshire 03824