Organizers, EmbryonicNucleolus Organizer RegionVertebratesGoosecoid ProteinBody PatterningEmbryonic InductionGastrulaXenopus ProteinsGene Expression Regulation, DevelopmentalSilver StainingEmbryo, NonmammalianZebrafish ProteinsEmbryologyZebrafishHomeodomain ProteinsOtx Transcription FactorsXenopusMesodermFibroblast Growth Factor 8RhombencephalonIn Situ HybridizationNodal ProteinNotochordXenopus laevisHydraEctodermWnt ProteinsHeadMesencephalonMolecular Sequence DataBone Morphogenetic ProteinsMorphogenesisNodal Signaling LigandsNervous SystemAxisIntercellular Signaling Peptides and ProteinsGenes, HomeoboxTissue TransplantationLIM-Homeodomain ProteinsTranscription FactorsAmino Acid SequenceSignal TransductionChordata, NonvertebrateSilverCell NucleolusWnt1 ProteinEndodermChick EmbryoAmphibiansLeft-Right Determination FactorsActivinsT-Box Domain ProteinsBase SequenceFetal ProteinsFibroblast Growth FactorsChordataProteinsEvolution, MolecularSequence Homology, Amino AcidMetencephalonGlycoproteinsBlastulaBiological EvolutionBone Morphogenetic Protein 4BlastodermRepressor ProteinsTwins, ConjoinedAnimals, Genetically ModifiedTrans-ActivatorsDrosophila ProteinsDrosophilaNerve Tissue ProteinsMatrix Attachment Region Binding ProteinsDNA-Binding Proteinsbeta CateninCentral Nervous SystemTransforming Growth Factor betaNeural PlateEmbryonic DevelopmentCloning, MolecularProsencephalonSilver NitrateRNA, MessengerModels, BiologicalHepatocyte Nuclear Factor 3-betaMutationSequence AlignmentChromosomesInhibinsTectum MesencephaliTailMicroinjectionsCell DifferentiationAvian ProteinsConserved SequenceGenes, DevelopmentalFishesLampreysCell LineageQuail