Fig. 1From: Transplantation of human umbilical cord mesenchymal stem cells to treat premature ovarian failureFolliculogenesis: ovarian follicles enjoy an immature oocyte and somatic cells. Ovarian follicle maturation illustrates the passage of several small primordial follicles into pre-ovulatory follicle, which ultimately results in the maturation of oocyteBack to article page