1. Department of Ob/Gyn & Reproductive Sciences, Eli and Edythe Broad Center for Regeneration Medicine and Stem Cell Research, University of California, San Francisco, 35 Medical Center Way, San Francisco, CA 94143, USA
2. University Paris Diderot, Sorbonne Paris Cite', Laboratory of Development of the Gonads; CEA, DSV, iRCM, SCSR, LDG; INSERM, Unit of Genetic stability, Stem cells and Radiation, UMR-967; University Paris-Sud, Fontenay-aux-Roses F-92265, France
3. Department of Cell Biology and Human Anatomy, University of California, Davis School of Medicine, 4422 Tupper Hall, Davis, CA 95616, USA