作者单位:Univ Calif Davis, Davis Sch Med, Dept Cell Biol & Human Anat, 4422 Tupper Hall, Davis, CA 95616 USA[1]Univ Paris Diderot, Sorbonne Paris Cite, Lab Dev Gonads, F-92265 Fontenay Aux Roses, France[2]Univ Calif San Francisco, Eli & Edythe Broad Ctr Regenerat Med & Stem Cell, Dept Ob Gyn & Reprod[3]