1. From the Cellular and Molecular Physiology Laboratory (CMPL) (P.C., A.T., F.S., M.G., M.F., V.G., R.S.M., L.S.), Department of Obstetrics and Gynaecology, Medical Research Centre (CIM), School of Medicine, Faculty of Medicine, Pontificia Universidad Católica de Chile, Santiago; Universidad de Concepción (V.G.), Chile; and the Departament de Bioquímica i Biologia Molecular (M.P.-A.), Universitat de Barcelona, Spain.