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Organizers, EmbryonicNucleolus Organizer RegionBody PatterningVertebratesGoosecoid ProteinNodal ProteinGene Expression Regulation, DevelopmentalEmbryonic InductionGastrulaXenopus ProteinsHomeodomain ProteinsSilver StainingEmbryo, NonmammalianFunctional LateralityZebrafish ProteinsEmbryologyOtx Transcription FactorsXenopusZebrafishMesodermTranscription FactorsFibroblast Growth Factor 8Caenorhabditis elegansRhombencephalonGenes, HelminthIn Situ HybridizationNotochordMolecular Sequence DataHydraXenopus laevisWnt ProteinsHeadEctodermMesencephalonNodal Signaling LigandsBone Morphogenetic ProteinsAxisIntercellular Signaling Peptides and ProteinsNervous SystemMorphogenesisCaenorhabditis elegans ProteinsTissue TransplantationLIM-Homeodomain ProteinsGenes, HomeoboxBase SequenceSilverSignal TransductionCell NucleolusMutationDominance, CerebralWnt1 ProteinLeft-Right Determination FactorsAmino Acid SequenceEndodermActivinsChick EmbryoHeartChordata, NonvertebrateT-Box Domain ProteinsAmphibiansNeuronsFetal ProteinsVentricular Function, LeftMetencephalonProteinsFibroblast Growth FactorsBrainBlastulaGlycoproteinsMovementTwins, ConjoinedBlastodermChordataBone Morphogenetic Protein 4Sequence Homology, Amino AcidRepressor ProteinsMatrix Attachment Region Binding ProteinsVentricular Dysfunction, Leftbeta CateninTransforming Growth Factor betaTrans-ActivatorsMagnetic Resonance ImagingSilver NitrateEvolution, MolecularNerve Tissue ProteinsVentricular Function, RightNeural PlateHepatocyte Nuclear Factor 3-betaBrain MappingDNA-Binding ProteinsCentral Nervous SystemAnimals, Genetically ModifiedProsencephalonBiological EvolutionInhibinsRNA, MessengerTectum MesencephaliDrosophilaDrosophila ProteinsChromosomes