Clone CellsEmbryo, MammalianBlastocystEmbryo, NonmammalianChick EmbryoEmbryonic DevelopmentEmbryonic and Fetal DevelopmentEmbryo ImplantationGene Expression Regulation, DevelopmentalCleavage Stage, OvumMorulaBlastomeresPregnancyMolecular Sequence DataBase SequenceEmbryo LossIn Situ HybridizationZygoteGastrulaCloning, MolecularEndodermBody PatterningMesodermCulture TechniquesFertilization in VitroAmino Acid SequenceMorphogenesisEctogenesisEctodermMice, Inbred ICRMice, Inbred StrainsRNA, MessengerCell DifferentiationTranscription FactorsCryopreservationCloning, OrganismHomeodomain ProteinsEmbryo Culture TechniquesOocytesDNA, ComplementaryMice, Inbred C57BLFetal ViabilityZebrafishChimeraDNANuclear Transfer TechniquesParthenogenesisSomitesMutationEmbryo DispositionCell LinePhenotypeMice, Inbred CBAYolk SacGerm LayersMice, TransgenicTime FactorsGene ExpressionMice, Mutant StrainsCell LineageDNA-Binding ProteinsSignal TransductionNodal ProteinMice, KnockoutEmbryonic InductionCell DivisionNeural CrestTranscription, GeneticNervous SystemCells, CulturedZebrafish ProteinsSequence Homology, Amino AcidTrophoblastsCulture MediaGenes, LethalGestational AgeDNA PrimersFibroblastsPolymerase Chain ReactionEmbryo ResearchSingle Embryo TransferMesonephrosStem CellsXenopus ProteinsBlastocyst Inner Cell MassMicroinjectionsNucleic Acid HybridizationNeural Tube DefectsImmunohistochemistryFertilizationProteinsTeratogensReverse Transcriptase Polymerase Chain ReactionSuperovulationGenes, HomeoboxCell NucleusNotochordGerm CellsRhombencephalonTrans-Activators