1. Molecular Biology of Reproduction and Development Research Group, Biomedical Research Institute August Pi i Sunyer (IDIBAPS), Department of Biomedical Sciences, Faculty of Medicine and Health Sciences, University of Barcelona, and Biochemistry and Molecular Genetics Service, Hospital Clínic, Casanova 143, 08036 Barcelona, Spain
2. Department of Obstetrics and Gynecology, and Center for Molecular Medicine and Genetics, Wayne State University School of Medicine, Detroit, MI 48201, USA