MesodermGastrulaEmbryonic InductionGene Expression Regulation, DevelopmentalSomitesEctodermBody PatterningEmbryo, NonmammalianXenopus ProteinsDesulfuromonasIn Situ HybridizationT-Box Domain ProteinsMorphogenesisChick EmbryoGastrulationZebrafish ProteinsXenopusHomeodomain ProteinsZebrafishBone Morphogenetic ProteinsNodal ProteinActivinsTranscription FactorsXenopus laevisBone Morphogenetic Protein 4Goosecoid ProteinGenes, HomeoboxCoturnixQuailFibroblast Growth FactorsCell DifferentiationNodal Signaling LigandsSignal TransductionNervous SystemTwist Transcription FactorWnt ProteinsEmbryonic and Fetal DevelopmentDrosophilaPrimitive StreakDrosophila ProteinsFibroblast Growth Factor 8Molecular Sequence DataCell LineageGerm LayersEmbryonic DevelopmentNeural CrestExtremitiesLimb BudsTailHeadInhibinsDNA-Binding ProteinsEmbryo, MammalianBasic Helix-Loop-Helix Transcription FactorsTissue TransplantationBranchial RegionTrans-ActivatorsVisceraAvian ProteinsChemistry, InorganicAmino Acid SequenceBlastodermHeartTransforming Growth Factor betaLeft-Right Determination FactorsReceptors, Fibroblast Growth FactorAnimals, Genetically ModifiedMyogenic Regulatory Factor 5Embryonic Stem CellsProteinsBlastulaGenes, InsectCell MovementHedgehog ProteinsReceptors, NotchMyoD ProteinWnt1 ProteinWnt3 ProteinFinger InjuriesChimeraRNA, MessengerStem CellsCentral Nervous SystemRepressor ProteinsVertebratesCulture TechniquesHelix-Loop-Helix MotifsBone Morphogenetic Protein ReceptorsDimethylphenylpiperazinium IodideDigestive SystemSequence Homology, Amino AcidModels, BiologicalPhenotypeMicroinjectionsPaired Box Transcription FactorsNeural PlateReceptors, Growth FactorPAX2 Transcription FactorSOXF Transcription FactorsEncephalitis Virus, California