Embryonic InductionNervous SystemEctodermPleurodelesOrganizers, EmbryonicNeural PlateGastrulaXenopus ProteinsBone Morphogenetic ProteinsEmbryo, NonmammalianXenopus laevisFibroblast Growth FactorsXenopusGene Expression Regulation, DevelopmentalEmbryologyEnzyme InductionMesodermBone Morphogenetic Protein 4Central Nervous SystemTriturusSignal TransductionChick EmbryoNerve TissueBody PatterningOtx Transcription FactorsCell DifferentiationIn Situ HybridizationHMGB ProteinsEmbryonic Stem CellsUrochordataSmad6 ProteinHomeodomain ProteinsGastrulationSOXB1 Transcription FactorsNeuronsGerm LayersSalamandridaeBone Morphogenetic Protein ReceptorsFibroblast Growth Factor 3NeurogenesisWnt ProteinsAmphibiansTranscription FactorsIntercellular Signaling Peptides and ProteinsEpidermisEndodermRNA, MessengerCarrier ProteinsBlastomeresCells, CulturedNeural CrestFibroblast Growth Factor 8Molecular Sequence DataSmad1 ProteinBone Morphogenetic Protein 7QuailTrans-ActivatorsFollistatinProteinsNotochordActivinsDNA-Binding ProteinsNerve Tissue ProteinsTime FactorsBase SequenceMorphogenesisMicroinjectionsReceptors, Fibroblast Growth FactorCell LineageTranscription, GeneticModels, BiologicalNeural Stem CellsVertebratesGlycoproteinsImmunohistochemistryTransforming Growth Factor betaAmino Acid SequenceReverse Transcriptase Polymerase Chain ReactionRepressor ProteinsCloning, MolecularZebrafish ProteinsTretinoinProto-Oncogene ProteinsNuclear ProteinsMutationGene Expression RegulationBiological MarkersApoptosisCell LineStem CellsSpinal Cordbeta CateninBrainMice, Inbred C57BLPromoter Regions, GeneticInduction ChemotherapyRemission InductionTumor Cells, CulturedCell Line, TumorMice, Inbred BALB C