Fig. 7From: From primordial germ cells to primordial follicles: a review and visual representation of early ovarian development in miceSignaling between granulosa cells (blue outline) and oocytes (red outline) initiating the formation of germ cell nests occurs from embryonic day 16 (E16) to E18. The exact signaling pathways for the formation of germ cell nests is unknownBack to article page