In Vitro Oocyte Maturation TechniquesOocytesEmbryo Culture TechniquesOogenesisFertilization in VitroFertilizationSperm Injections, IntracytoplasmicSpermatozoaFollicular FluidOvarian FollicleMeiosisPregnancySperm-Ovum InteractionsMetaphaseCumulus CellsOvumOocyte DonationCryopreservationZona PellucidaBlastocystEmbryonic DevelopmentOocyte RetrievalMicroinjectionsZygoteEmbryo TransferXenopus laevisParthenogenesisOvaryXenopusCleavage Stage, OvumPolar BodiesCryoprotective AgentsMaturation-Promoting FactorProto-Oncogene Proteins c-mosChorionic GonadotropinGenes, mosInfertility, Female