Growth differentiation factor 9 (GDF-9) gene is a growth factor secreted by oocytes in growthing ovarian follicles, which is essential for normal follicular development.

• 生长分化因子9(GDF-9)基因是由卵母细胞分泌的一种生长因子，它对早期卵泡的生长和分化起着重要的作用。