MesodermOrganizers, EmbryonicGastrulaNucleolus Organizer RegionEmbryonic InductionGoosecoid ProteinBody PatterningNotochordEmbryo, NonmammalianXenopus ProteinsGene Expression Regulation, DevelopmentalEctodermZebrafishZebrafish ProteinsNodal Signaling LigandsIn Situ HybridizationNodal ProteinGastrulationHomeodomain ProteinsMorphogenesisXenopusChick EmbryoEndodermXenopus laevisSomitesTranscription FactorsBone Morphogenetic Protein 7Fetal ProteinsIntercellular Signaling Peptides and ProteinsT-Box Domain ProteinsSignal TransductionBone Morphogenetic ProteinsTransforming Growth Factor betaSilver StainingFibroblast Growth Factor 8ProteinsMolecular Sequence DataActivinsWnt ProteinsGenes, HomeoboxEmbryologyNervous SystemOtx Transcription FactorsHeadBone Morphogenetic Protein 4Fibroblast Growth FactorsMutationTissue TransplantationRhombencephalonQuailCell DifferentiationCoturnixAxisLeft-Right Determination FactorsWnt1 ProteinInhibinsDrosophilaLIM-Homeodomain ProteinsBlastodermCell LineageBlastulaDrosophila ProteinsEmbryonic DevelopmentTailDNA-Binding ProteinsTrans-ActivatorsGerm LayersEmbryonic and Fetal DevelopmentMesencephalonAmino Acid SequenceHydraNeural CrestBase SequenceHedgehog ProteinsEmbryo, MammalianTwist Transcription FactorLimb BudsRepressor ProteinsExtremitiesAvian ProteinsBasic Helix-Loop-Helix Transcription FactorsPrimitive StreakAnimals, Genetically ModifiedCentral Nervous SystemNeural PlateGlycoproteinsVertebratesMicroinjectionsRNA, Messengerbeta CateninSilverBone Morphogenetic Protein ReceptorsReceptors, Fibroblast Growth FactorBlastomeresCell NucleolusSequence Homology, Amino AcidReceptors, NotchModels, BiologicalCell MovementHepatocyte Nuclear Factor 3-beta