1. From the Department of Pharmacology and Therapeutics, University of Florida, Gainesville, Florida;
2. Laboratoire de Biologie Mole´culaire et de Ge´nie Ge´ne´tique, Universite´ de Lie`ge, Lie`ge, Belgium; and
3. Department of Obstetrics, Gynecology, and Reproductive Sciences, University of California at San Francisco, San Francisco, California.