1. Departments of Internal Medicine (C.P.T., N.S.R., E.A.K., K.Z.L.), University of Iowa College of Medicine, Iowa City, Iowa 52242
2. The Graduate Program in Molecular Biology (C.P.T.), University of Iowa College of Medicine, Iowa City, Iowa 52242
3. The Veterans Affairs Medical Center (C.P.T.), Iowa City, Iowa 52242
4. Obstetrics and Gynecology (J.I.A.), University of Iowa College of Medicine, Iowa City, Iowa 52242
5. Charité University of Medicine (F.H., R.D.), D-10117 Berlin, Germany
6. Department of Comparative Biosciences (T.G.G.), School of Veterinary Medicine, and Department of Obstetrics and Gynecology, School of Medicine and Public Health, and the Wisconsin National Primate Research Center, University of Wisconsin-Madison, Madison, Wisconsin 53706