1. California National Primate Research Center, University of California
2. Department of Obstetrics and Gynecology, School of Medicine
3. Department of Anatomy, Physiology and Cell Biology, School of Veterinary Medicine
4. Center for Health and the Environment, University of California, Davis, California 95616
5. Reproductive Medicine Group, Reproductive & Developmental Biology Laboratory, National Institute of Environmental Health Sciences, NIH, Research Triangle Park, North Carolina 27709
6. School of Molecular Biosciences, Washington State University, Pullman, Washington 99164