1. Center for Pregnancy and Newborn Research (F.J.R., T.L.P., T.J.), Department of Obstetrics and Gynecology, University of Texas Health Science Center, San Antonio, Texas 78229
2. Institute of Neuroscience and Physiology (N.J.), Göteborg University, 405 30 Göteborg, Sweden
3. Division of Bio-System Pharmacology (Y.K.), Department of Pharmacology, Graduate School of Medicine, Osaka University, Osaka 565-0871, Japan
4. Department of Obstetrics and Gynecology (P.D.P.), Medical College of Georgia, Augusta, Georgia 30912