EctodermGastrulationGastrulaMesodermEmbryonic InductionGene Expression Regulation, DevelopmentalEndodermEmbryo, NonmammalianMorphogenesisBody PatterningEmbryonic and Fetal DevelopmentIn Situ HybridizationPolycomb Repressive Complex 2ChimeraBone Morphogenetic ProteinsXenopus laevisXenopus ProteinsBlastocystCell DifferentiationEmbryo, MammalianTranscription FactorsCulture TechniquesZebrafish ProteinsZebrafishDrosophila ProteinsSignal TransductionMolecular Sequence DataNervous SystemGerm LayersXenopusBlastulaNotochordDNA-Binding ProteinsFetal ProteinsNodal ProteinSea UrchinsHomeodomain ProteinsChick EmbryoWnt ProteinsEmbryonic DevelopmentBone Morphogenetic Protein 4Organizers, EmbryonicBlastodermT-Box Domain ProteinsPleurodelesFibroblast Growth FactorsNeural CrestGoosecoid ProteinNeural PlateCell MovementPrimitive StreakGenes, HomeoboxOtx Transcription FactorsActivinsFibroblast Growth Factor 8Cell LineageNodal Signaling LigandsDrosophilaAmino Acid SequenceSomitesHeadBlastomeresQuailEmbryonic StructuresBase SequenceCentral Nervous SystemLeft-Right Determination FactorsExtremitiesZygoteSequence Homology, Amino AcidCell PolarityProteinsTrans-ActivatorsModels, BiologicalRNA, MessengerPhenotypeMicroinjectionsLimb BudsStrongylocentrotus purpuratusAnimals, Genetically ModifiedTransforming Growth Factor betaMorpholinosTailAmphibiansAvian ProteinsBranchial RegionRhombencephalonMutationNeurulationPaired Box Transcription FactorsUrochordataIntercellular Signaling Peptides and ProteinsOligonucleotides, AntisenseHedgehog ProteinsNeural TubeMicroscopy, Electron, ScanningBone Morphogenetic Protein ReceptorsFrizzled ReceptorsCloning, MolecularRepressor Proteins