1. Magee-Womens Research Institute (L.X., J.-F.M., T.C., W.T.P., E.S., Y.S.), Department of OBGYN and Reproductive Sciences, University of Pittsburgh, Pennsylvania 15213
2. Medical Systems Biology Research Center (L.X.), Department of Biomedical Engineering, Tsinghua University School of Medicine, Beijing 100084 China
3. Department of Obstetrics and Fetal-Maternal Medicine (M.K.), Reproductive Biology Unit, Medical University of Vienna, Vienna, A-1090 Austria
4. Department of Microbiology and Molecular Genetics (Y.S.), University of Pittsburgh, Pennsylvania 15213