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Mature (Graafian) Follicle. Each ovarian follicle contains a primary oocyte that is arrested in the prophase of the first meiotic division. Near the time of ovulation, the primary oocyte continues the first meiotic division. This image illustrates a primary oocyte in the metaphase stage of the first meiotic division (black arrow). The daughter cells will be the a secondary oocyte and the first polar body. The granulosa cells are encircled in black and the theca interna and externa are encircled in green.