NotochordMesodermGenes, HomeoboxHomeodomain ProteinsGene Expression Regulation, DevelopmentalEmbryonic InductionFetal ProteinsGastrulaEmbryo, NonmammalianBody PatterningSomitesIn Situ HybridizationUrochordataEctodermCiona intestinalisT-Box Domain ProteinsMorphogenesisZebrafish ProteinsChick EmbryoTranscription FactorsZebrafishXenopus ProteinsMolecular Sequence DataGoosecoid ProteinTailGastrulationNervous SystemBone Morphogenetic ProteinsCell DifferentiationXenopus laevisXenopusAmino Acid SequenceQuailCoturnixBase SequenceHedgehog ProteinsBone Morphogenetic Protein 4Trans-ActivatorsEmbryonic and Fetal DevelopmentNodal ProteinChordata, NonvertebrateHepatocyte Nuclear Factor 3-betaSignal TransductionActivinsDNA-Binding ProteinsAvian ProteinsCentral Nervous SystemFibroblast Growth FactorsLIM-Homeodomain ProteinsEmbryo, MammalianCell LineageEmbryonic DevelopmentSequence Homology, Amino AcidDrosophila ProteinsNeural CrestExtremitiesWnt ProteinsDrosophilaHeadMutationAnimals, Genetically ModifiedTissue TransplantationEndodermNodal Signaling LigandsChordataOrganizers, EmbryonicRNA, MessengerGene ExpressionCloning, MolecularOtx Transcription FactorsRepressor ProteinsFibroblast Growth Factor 8Germ LayersVertebratesBlastomeresPhenotypeProteinsDNA, ComplementaryBasic Helix-Loop-Helix Transcription FactorsSpineTwist Transcription FactorCell MovementDNA PrimersLeft-Right Determination FactorsInhibinsAntennapedia Homeodomain ProteinImmunohistochemistryBranchial RegionMSX1 Transcription FactorStem CellsHeartLimb BudsPaired Box Transcription FactorsBlastodermLarvaMyoD ProteinMyogenic Regulatory Factor 5Mice, Mutant StrainsPrimitive StreakGenes, Insect