1. Department of Internal Medicine or Cell Biology (F.C.L.J.), NIH Specialized Cooperative Center in Reproduction Research, University of Virginia Health Sciences Center, Charlottesville, Virginia 22908;
2. Division of Endocrinology (F.C.L.J., R.N.D., J.C.G., G.Z., J.D.V.), NIH Specialized Cooperative Center in Reproduction Research, University of Virginia Health Sciences Center, Charlottesville, Virginia 22908;
3. Department of Medicine (R.J.U.), University of Texas Medical Branch, Galveston, Texas 77555