In Vitro Oocyte Maturation TechniquesOocytesCryopreservationOogenesisEmbryo Culture TechniquesCryoprotective AgentsSpindle ApparatusMeiosisSemen PreservationFertilization in VitroFertilizationOocyte RetrievalEmbryo TransferOvaryMetaphaseSpermatozoaOvarian FollicleCumulus CellsVitrificationFertility PreservationOocyte DonationBlastocystSperm Injections, IntracytoplasmicXenopus laevisMuscle SpindlesOvumEmbryonic DevelopmentPropylene GlycolMicroinjectionsXenopusFreezingMaturation-Promoting FactorEthylene GlycolOvulation InductionParthenogenesisPregnancyDimethyl SulfoxideEmbryo, MammalianZygoteCleavage Stage, OvumStarfishChorionic GonadotropinReproductive Techniques, AssistedTissue PreservationPregnancy RateSperm MotilityGenes, mosInfertility, FemaleProto-Oncogene Proteins c-mos