In Vitro Oocyte Maturation TechniquesOocytesOogenesisEmbryo Culture TechniquesMeiosisCumulus CellsFertilizationMaturation-Promoting FactorGenes, mosMetaphaseOvarian FollicleXenopus laevisEmbryonic DevelopmentMicroinjectionsProto-Oncogene Proteins c-mosPolar BodiesXenopusOvaryOvumFertilization in VitroParthenogenesisSperm-Ovum InteractionsEgg ProteinsBlastocystHydroxyprogesteronesMammalsZona PellucidaOocyte DonationProgesteroneStarfishChorionic GonadotropinOocyte RetrievalZygoteMeiotic Prophase IMolecular Sequence DataOvulationXenopus ProteinsCyclin B1Cells, CulturedGranulosa CellsCyclin BRNA, Messenger