GastrulationGastrulaEmbryo, NonmammalianMesodermGene Expression Regulation, DevelopmentalBody PatterningXenopus ProteinsZebrafishEndodermZebrafish ProteinsEctodermMorphogenesisIn Situ HybridizationEmbryonic InductionXenopus laevisFetal ProteinsXenopusBlastulaNotochordNodal ProteinGerm LayersEmbryonic DevelopmentBlastodermPrimitive StreakWnt ProteinsT-Box Domain ProteinsBone Morphogenetic ProteinsOrganizers, EmbryonicSignal TransductionMolecular Sequence DataPleurodelesNervous SystemCell MovementHomeodomain ProteinsGoosecoid ProteinMutationEmbryonic and Fetal DevelopmentSea UrchinsTranscription FactorsAmino Acid SequencePhenotypeDrosophila ProteinsActivinsNodal Signaling LigandsDrosophilaCell PolarityBase SequenceBlastomeresChick EmbryoLeft-Right Determination FactorsFibroblast Growth FactorsCell DifferentiationSequence Homology, Amino AcidGenes, HomeoboxBone Morphogenetic Protein 4SomitesCell LineageHeart Septal Defects, VentricularEmbryo, MammalianZygoteBlastocystOtx Transcription FactorsHeart Defects, CongenitalHeadTailRNA, MessengerAnimals, Genetically ModifiedDNA-Binding ProteinsHeart Septal Defects, AtrialModels, BiologicalNeural PlateProteinsMorpholinosFrizzled ReceptorsIntercellular Signaling Peptides and ProteinsOligonucleotides, AntisenseTolloid-Like MetalloproteinasesUrochordataMicroinjectionsCadherinsTransforming Growth Factor betaNeural CrestNeurulationAvian ProteinsLytechinusCloning, MolecularCentral Nervous SystemGenes, LethalMice, Mutant StrainsChimeraAmphibiansGene TargetingFibroblast Growth Factor 8Embryo LossCell AdhesionMicroscopy, Electron, ScanningSOX Transcription FactorsDNA PrimersCaenorhabditis elegansTime Factors