ZygoteOocytesEmbryo, MammalianEmbryo, NonmammalianChick EmbryoBlastocystEmbryo ImplantationEmbryonic DevelopmentCleavage Stage, OvumPregnancyEmbryonic and Fetal DevelopmentFertilization in VitroGene Expression Regulation, DevelopmentalEmbryo LossFertilizationBlastomeresCryopreservationOogenesisOocyte DonationMorulaEmbryo Implantation, DelayedZygote Intrafallopian TransferSperm Injections, IntracytoplasmicXenopus laevisMicroinjectionsEmbryo TransferPregnancy RateParthenogenesisMeiosisNuclear Transfer TechniquesOocyte RetrievalIn Vitro Oocyte Maturation TechniquesTime FactorsXenopusEctogenesisOvumEmbryo DispositionCulture TechniquesCochlear ImplantationSpermatozoaIn Situ HybridizationZebrafishMolecular Sequence DataUterusBody PatterningRNA, MessengerGastrulaMetaphaseLens Implantation, IntraocularEmbryo Culture TechniquesZona PellucidaCell NucleusCloning, OrganismFetal ViabilityCumulus CellsSuperovulationSingle Embryo Transfer