1. Laboratory of Animal Reproduction, Graduate School of Bioagricultural Sciences, Nagoya University, Nagoya 464-8601, Japan
2. Department of Pathobiochemistry, Faculty of Pharmacy, Meijo University (Y.T., N.T., I.M.), Nagoya 468-8503, Japan
3. the Reproductive Sciences Program (R.C.T., D.L.F.), University of Michigan, Ann Arbor, Michigan 48109
4. the Departments of Obstetrics and Gynecology and Biology (D.L.F.), University of Michigan, Ann Arbor, Michigan 48109