NeurulationNeural Tube DefectsNervous SystemNeural TubeGastrulaEmbryo, NonmammalianEctodermNeural CrestMorphogenesisGene Expression Regulation, DevelopmentalCentral Nervous SystemNotochordXenopus ProteinsChick EmbryoAmbystoma mexicanumIn Situ HybridizationGastrulationNeuroepithelial CellsXenopus laevisChordataMesodermXenopusBody PatterningEmbryo, MammalianNeural PlateZebrafishEmbryonic InductionAmbystomaZebrafish ProteinsEmbryonic and Fetal DevelopmentEctogenesisMicroscopy, Electron, ScanningCoturnixSpinal DysraphismRhombencephalonEmbryonic DevelopmentTeratogensToxicogeneticsCell PolarityMeningomyeloceleUrochordataTailCytochalasinsNuclear Receptor Subfamily 6, Group A, Member 1Culture TechniquesHeadQuailAvian ProteinsIntegrin alpha6Mice, Mutant StrainsFetal ProteinsSomitesEmbryo Culture TechniquesHomeodomain ProteinsEndodermGlycosidesEpitheliumMesencephalonSkullEpidermisMolecular Sequence DataTranscription FactorsBone Morphogenetic Proteins