EndodermMesodermGastrulaGene Expression Regulation, DevelopmentalSOXF Transcription FactorsEmbryonic InductionEctodermBody PatterningEmbryo, NonmammalianIn Situ HybridizationGerm LayersNodal ProteinXenopus ProteinsMorphogenesisHomeodomain ProteinsVisceraCell DifferentiationFetal ProteinsZebrafish ProteinsT-Box Domain ProteinsSomitesActivinsGATA5 Transcription FactorGATA6 Transcription FactorDigestive SystemChick EmbryoGastrulationZebrafishTranscription FactorsHepatocyte Nuclear Factor 3-betaEmbryonic Stem CellsSOX Transcription FactorsCell LineageYolk SacEmbryo, MammalianBone Morphogenetic ProteinsBone Morphogenetic Protein 4Embryonic and Fetal DevelopmentXenopusEmbryonic DevelopmentCoturnixGATA Transcription FactorsSignal TransductionGATA4 Transcription FactorFibroblast Growth FactorsGenes, HomeoboxQuailHMGB ProteinsBranchial RegionPrimitive StreakHigh Mobility Group ProteinsBlastocystXenopus laevisGoosecoid ProteinWnt ProteinsDNA-Binding ProteinsBlastulaChimeraMolecular Sequence DataOtx Transcription FactorsHeadTrans-ActivatorsLeft-Right Determination FactorsNotochordFibroblast Growth Factor 4TretinoinTeratomaFibroblast Growth Factor 8Neural CrestTissue TransplantationStem CellsNervous SystemBase SequenceEmbryoid BodiesTransforming Growth Factor betaPancreasBlastodermOrganogenesisHepatocyte Nuclear Factor 3-gammaDrosophilaHedgehog ProteinsHeartAmino Acid SequenceModels, BiologicalRNA, MessengerBlastomeresDrosophila ProteinsProteinsAnimals, Genetically ModifiedWnt3 ProteinInhibinsTailVertebratesCell MovementUrochordataAvian ProteinsPharynxSea UrchinsBasic Helix-Loop-Helix Transcription FactorsCulture Techniques