MesodermGastrulaEctodermEmbryonic InductionGene Expression Regulation, DevelopmentalBody PatterningZebrafish ProteinsXenopus ProteinsZebrafishIn Situ HybridizationEmbryo, NonmammalianBone Morphogenetic ProteinsMorphogenesisChick EmbryoHomeodomain ProteinsTranscription FactorsEndodermSomitesMolecular Sequence DataHeartDNA-Binding ProteinsSignal TransductionFetal ProteinsT-Box Domain ProteinsAmino Acid SequenceAmyotrophic Lateral SclerosisGastrulationXenopusNodal ProteinActivinsXenopus laevisBone Morphogenetic Protein 4CoturnixGenes, HomeoboxGoosecoid ProteinQuailFibroblast Growth FactorsCell DifferentiationLateral Line SystemNodal Signaling LigandsNervous SystemEmbryonic and Fetal DevelopmentDrosophilaWnt ProteinsTwist Transcription FactorDrosophila ProteinsCell LineageFibroblast Growth Factor 8ExtremitiesPrimitive StreakHeadNeural CrestGerm LayersEmbryonic DevelopmentLimb BudsTailEmbryo, MammalianBasic Helix-Loop-Helix Transcription FactorsInhibinsTissue TransplantationBranchial RegionTrans-ActivatorsBase SequenceHypothalamic Area, LateralVisceraAvian ProteinsLateral VentriclesAnimals, Genetically ModifiedMutationLeft-Right Determination FactorsBlastodermTransforming Growth Factor betaCell MovementProteinsModels, BiologicalMyogenic Regulatory Factor 5Receptors, NotchReceptors, Fibroblast Growth FactorHedgehog ProteinsGenes, InsectEmbryonic Stem CellsCentral Nervous SystemBlastulaRNA, MessengerPhenotypeStem CellsMyoD ProteinMicroinjectionsChimeraWnt1 ProteinRepressor ProteinsSequence Homology, Amino AcidGene ExpressionWnt3 ProteinVertebratesCulture TechniquesTime FactorsImmunohistochemistryHelix-Loop-Helix MotifsPaired Box Transcription Factors