In Vitro Oocyte Maturation TechniquesOocytesOogenesisEmbryo Culture TechniquesMeiosisOocyte RetrievalStarfishMaturation-Promoting FactorFertilizationFertilization in VitroCumulus CellsXenopus laevisOocyte DonationEmbryonic DevelopmentMetaphaseXenopusOvarian FollicleSperm Injections, IntracytoplasmicCryopreservationOvumBlastocystEmbryo TransferMicroinjectionsChorionic GonadotropinOvaryParthenogenesisGenes, mosOvulation InductionSperm-Ovum InteractionsProto-Oncogene Proteins c-mos