第八章卵巢在胚胎发育过程中的损伤：毒物对胚胎干细胞定向分化为卵巢颗粒细胞的毒作用及其机制研究（Ovarian Injury During Embryonic Development:Effects of Toxicants on the Embryonic Stem Cells Differentiated into Ovarian Granulosa Cells and Their Mecha