GastrulationGastrulaEmbryo, NonmammalianMesodermGene Expression Regulation, DevelopmentalBody PatterningXenopus ProteinsEndodermEctodermZebrafishZebrafish ProteinsMorphogenesisIn Situ HybridizationEmbryonic InductionXenopus laevisFetal ProteinsXenopusBlastulaNotochordNodal ProteinGerm LayersBlastodermPrimitive StreakEmbryonic DevelopmentWnt ProteinsOrganizers, EmbryonicT-Box Domain ProteinsBone Morphogenetic ProteinsPleurodelesGoosecoid ProteinNervous SystemCell MovementHomeodomain ProteinsSignal TransductionSea UrchinsMolecular Sequence DataEmbryonic and Fetal DevelopmentActivinsNodal Signaling LigandsTranscription FactorsBlastomeresAmino Acid SequenceLeft-Right Determination FactorsDrosophila ProteinsChick EmbryoFibroblast Growth FactorsCell PolarityDrosophilaGenes, HomeoboxBone Morphogenetic Protein 4Cell LineageZygoteSomitesBlastocystOtx Transcription FactorsCell DifferentiationSequence Homology, Amino AcidHeadPhenotypeTailBase SequenceNeural PlateEmbryo, MammalianUrochordataFrizzled ReceptorsTolloid-Like MetalloproteinasesOligonucleotides, AntisenseIntercellular Signaling Peptides and ProteinsMicroinjectionsMorpholinosRNA, MessengerMutationCadherinsLytechinusAnimals, Genetically ModifiedProteinsTransforming Growth Factor betaModels, BiologicalAvian ProteinsAmphibiansDNA-Binding ProteinsNeurulationSOX Transcription FactorsCentral Nervous SystemChimeraFibroblast Growth Factor 8Neural CrestCell AdhesionWnt Signaling PathwaySalamandridaeMicroscopy, Electron, ScanningCloning, MolecularCleavage Stage, OvumEmbryo LossHepatocyte Nuclear Factor 3-betaRhombencephalonVertebratesTrans-ActivatorsGlycoproteinsDNA, Complementary