Embryo, MammalianEmbryo, NonmammalianChick EmbryoBlastocystEmbryonic DevelopmentEmbryo ImplantationBlastomeresGene Expression Regulation, DevelopmentalEmbryonic and Fetal DevelopmentCleavage Stage, OvumZygoteEmbryo LossFertilization in VitroZebrafishGastrulaPregnancyBody PatterningEctogenesisEmbryo DispositionMorulaEmbryo Culture TechniquesMorphogenesisCryopreservationIn Situ HybridizationEctodermMesodermZebrafish ProteinsOocytesCloning, OrganismYolk SacCulture TechniquesParthenogenesisNuclear Transfer TechniquesSea UrchinsPregnancy RatePreimplantation DiagnosisHomeodomain ProteinsMicroinjectionsGenes, LethalEndodermEmbryonic InductionXenopus ProteinsEmbryo TransferMolecular Sequence DataGerm LayersNotochordBlastulaNervous SystemAnimals, Genetically ModifiedTranscription FactorsDrosophila ProteinsPhenotypeFertilizationDrosophilaXenopus laevisRNA, MessengerChimeraSomitesCell DifferentiationSeedsXenopusMutationSperm Injections, IntracytoplasmicTime FactorsFetal DeathFallopian TubesBase SequenceUrochordataBlastocyst Inner Cell MassEmbryo ResearchLive BirthNeural CrestSingle Embryo TransferOvumDrosophila melanogasterSignal TransductionTrophoblastsCell LineageAmino Acid SequenceGene TargetingNeural Tube DefectsCulture MediaMice, Mutant StrainsExtraembryonic MembranesBone Morphogenetic ProteinsMosaicismCell NucleusMice, Inbred C57BLMice, Inbred StrainsGestational AgeCattleModels, BiologicalDNA-Binding ProteinsImmunohistochemistryEmbryonic Stem CellsMice, KnockoutFetal ViabilityGene ExpressionCell CountMitosis