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Mammalian and Drosophila oogenesis. (A) Schematic representation of mammalian oogenesis from oogonium to mature ovum, depicting mitosis, meiosis, and maturation stages. (B) Drosophila oogenesis schematic representation, where initiation of the oocyte maturation occurs during meiosis (depicted here as overlapping of maturation and meiotic stages). 2n, diploid cells; 1n, haploid cells.
