Embryo, MammalianEmbryo, NonmammalianChick EmbryoEgg YolkEmbryo ImplantationOvumBlastocystEgg ProteinsEmbryonic DevelopmentEgg ShellEgg WhiteEmbryo LossGene Expression Regulation, DevelopmentalEmbryonic and Fetal DevelopmentFertilization in VitroCleavage Stage, OvumZygoteBlastomeresParasite Egg CountPregnancyFertilizationOocytesEmbryo DispositionMorulaZebrafishGastrulaCryopreservationEgg HypersensitivityBody PatterningIn Situ HybridizationOvipositionMorphogenesisEmbryo ResearchCulture TechniquesCloning, OrganismSingle Embryo TransferXenopus ProteinsMesodermNuclear Transfer TechniquesParthenogenesisMolecular Sequence DataEctogenesisEctodermZebrafish ProteinsSpermatozoaPregnancy RateXenopus laevisXenopusSperm-Ovum InteractionsMicroinjectionsVitelline MembraneSperm Injections, IntracytoplasmicDrosophilaSeedsUrochordataHomeodomain ProteinsDrosophila ProteinsBlastodermEndodermTranscription FactorsFetal ViabilityBase SequenceRNA, MessengerTime FactorsZona PellucidaEmbryonic InductionOogenesisAmino Acid SequenceAnimals, Genetically ModifiedSea UrchinsPreimplantation DiagnosisSuperovulationCell DifferentiationMutationYolk SacNotochordChickensLarvaNervous SystemPhenotypeDrosophila melanogasterChimeraEgg Proteins, DietaryCell NucleusEmbryologySignal TransductionQuailCulture MediaCattleSomitesFallopian TubesCoturnixMice, Inbred ICREchinodermataNeural CrestPregnancy OutcomeMice, Inbred StrainsDNA-Binding ProteinsGerm CellsOocyte Donation