OocytesOvaryOogenesisOocyte DonationOocyte RetrievalXenopus laevisMeiosisIn Vitro Oocyte Maturation TechniquesXenopusMicroinjectionsFertilizationMetaphaseCumulus CellsParthenogenesisBlastocystOvumSperm-Ovum InteractionsCryopreservationSperm Injections, IntracytoplasmicEmbryonic DevelopmentEmbryo TransferZona PellucidaMaturation-Promoting FactorSpermatozoaZygoteCleavage Stage, OvumEmbryo Culture TechniquesRNA, ComplementaryPregnancyEgg ProteinsNuclear Transfer TechniquesFollicular FluidOvulation InductionCytoplasmProto-Oncogene Proteins c-mosCryoprotective AgentsVitrificationCell NucleusPolar BodiesEmbryo, MammalianRNA, MessengerEmbryonic and Fetal DevelopmentPregnancy RateInfertility, FemaleChorionic GonadotropinMolecular Sequence DataOvulationGranulosa CellsCells, CulturedXenopus ProteinsCattleMorulaProgesteroneMeiotic Prophase IReproductive Techniques, AssistedSpindle ApparatusChromosomesEthylene GlycolAmino Acid SequenceVitellogenesisSwineGenes, mosProphaseBase SequenceGonadotropinsSuperovulationGrowth Differentiation Factor 9BlastomeresBone Morphogenetic Protein 15Gene Expression Regulation, DevelopmentalCDC2 Protein KinaseTime Factors