MesodermEndodermChick EmbryoGene Expression Regulation, DevelopmentalMorphogenesisHeartGastrulaEmbryonic InductionEctodermBody PatterningEmbryo, NonmammalianSOXF Transcription FactorsXenopus ProteinsIn Situ HybridizationSomitesFetal ProteinsNodal ProteinT-Box Domain ProteinsHomeodomain ProteinsZebrafish ProteinsGerm LayersCell DifferentiationGastrulationActivinsZebrafishVisceraTranscription FactorsBone Morphogenetic ProteinsXenopusCell LineageBone Morphogenetic Protein 4Digestive SystemGATA5 Transcription FactorCoturnixEmbryonic Stem CellsEmbryo, MammalianEmbryonic and Fetal DevelopmentFibroblast Growth FactorsGenes, HomeoboxGATA6 Transcription FactorQuailSignal TransductionHepatocyte Nuclear Factor 3-betaXenopus laevisYolk SacEmbryonic DevelopmentSOX Transcription FactorsGoosecoid ProteinPrimitive StreakBranchial RegionWnt ProteinsGATA Transcription FactorsDNA-Binding ProteinsGATA4 Transcription FactorMolecular Sequence DataHMGB ProteinsHeadBlastocystNervous SystemBlastulaTrans-ActivatorsFibroblast Growth Factor 8Neural CrestLeft-Right Determination FactorsHigh Mobility Group ProteinsChimeraDrosophilaTissue TransplantationDrosophila ProteinsNodal Signaling LigandsBase SequenceTransforming Growth Factor betaBlastodermStem CellsTailInhibinsTwist Transcription FactorTretinoinOtx Transcription FactorsAmino Acid SequenceFibroblast Growth Factor 4Hedgehog ProteinsBasic Helix-Loop-Helix Transcription FactorsAvian ProteinsAnimals, Genetically ModifiedExtremitiesProteinsRNA, MessengerModels, BiologicalCell MovementEmbryoid BodiesWnt3 ProteinOrganogenesisVertebratesBlastomeresTeratomaLimb BudsNotochordCulture TechniquesMutation