In Vitro Oocyte Maturation TechniquesOocytesOogenesisMeiosisEmbryo Culture TechniquesRNA, Messenger, StoredCumulus CellsFertilizationGenes, mosMetaphaseMaturation-Promoting FactorProto-Oncogene Proteins c-mosXenopus laevisOvarian FollicleEmbryonic DevelopmentMicroinjectionsXenopusFertilization in VitroBlastocystParthenogenesisOvaryOvumHydroxyprogesteronesChorionic GonadotropinOocyte DonationSperm-Ovum InteractionsProgesteroneOvulationStarfishOocyte RetrievalZygotePolar BodiesXenopus ProteinsCryopreservation