In Vitro Oocyte Maturation TechniquesOocytesEmbryo Culture TechniquesOogenesisOocyte DonationOocyte RetrievalXenopus laevisMeiosisXenopusMicroinjectionsFertilizationMetaphaseCumulus CellsParthenogenesisBlastocystOvumSperm-Ovum InteractionsCryopreservationOvarySperm Injections, IntracytoplasmicEmbryonic DevelopmentEmbryo TransferZona PellucidaMaturation-Promoting FactorSpermatozoaZygoteCleavage Stage, OvumRNA, ComplementaryPregnancyEgg ProteinsNuclear Transfer TechniquesFollicular FluidOvulation InductionCytoplasmProto-Oncogene Proteins c-mosCryoprotective AgentsVitrificationCell NucleusPolar BodiesEmbryo, MammalianRNA, MessengerEmbryonic and Fetal DevelopmentPregnancy RateInfertility, FemaleChorionic GonadotropinMolecular Sequence DataOvulationGranulosa Cells