MeiosisOocytesMetaphaseOogenesisFertilization in VitroCryopreservationFertilizationSperm Injections, IntracytoplasmicOocyte DonationCryoprotective AgentsMeiotic Prophase IZona PellucidaIn Vitro Oocyte Maturation TechniquesPropylene GlycolPolar BodiesBlastocystOocyte RetrievalSperm-Ovum InteractionsMicroinjectionsCumulus CellsEmbryonic DevelopmentZygoteSpermatozoaEthylene GlycolAneuploidyReproductive TechniquesParthenogenesisSpindle ApparatusChromosome SegregationVitrificationNondisjunction, GeneticOvaryChromosome PairingMicroscopy, PolarizationEmbryo Culture TechniquesChromatidsCleavage Stage, OvumXenopus laevisEmbryo TransferOvumPregnancyEmbryo, MammalianChromosomesInfertility, FemaleSpermatocytesProphaseFollicular FluidSynaptonemal ComplexSpores, FungalBlastomeresOvarian FollicleInfertilityCytoplasmEmbryonic and Fetal DevelopmentCholestenesXenopusMaternal AgeReproductive Techniques, AssistedChromosomes, HumanCell NucleusCrossing Over, GeneticMicrotubulesSpermatogenesisOvulation InductionChromosome AberrationsEgg ProteinsCell AgingSpermatidsIn Situ Hybridization, FluorescenceEndoplasmic Reticulum, SmoothMaturation-Promoting FactorProto-Oncogene Proteins c-mosDimethyl SulfoxideInfertility, MaleMitosisPachytene StageCells, CulturedRecombination, GeneticMicroscopy, ConfocalCentromereChorionic GonadotropinPregnancy RateCell Cycle ProteinsKearns-Sayre SyndromePhosphoinositide Phospholipase CGonadotropinsSperm HeadFertilityChromatinGerm CellsRNA, MessengerMolecular Sequence DataPolyploidyMicroscopy, FluorescenceCytogeneticsMicromanipulationFreezingBirefringenceKaryotypingHaploidy