In Vitro Oocyte Maturation TechniquesOocytesEmbryo Culture TechniquesOogenesisOvarian FollicleMeiosisFollicle Stimulating HormoneHair FollicleOvaryCumulus CellsXenopus laevisOvulationFertilizationOocyte DonationOocyte RetrievalXenopusMaturation-Promoting FactorFollicular FluidProgesteroneGenes, mosGranulosa Cells