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Organizers, EmbryonicNucleolus Organizer RegionBody PatterningGoosecoid ProteinNodal ProteinGastrulaEmbryonic InductionXenopus ProteinsGene Expression Regulation, DevelopmentalEmbryologyFunctional LateralityHomeodomain ProteinsXenopusMesodermEmbryo, NonmammalianSilver StainingZebrafish ProteinsGenes, HelminthCaenorhabditis elegansXenopus laevisTranscription FactorsOtx Transcription FactorsIntercellular Signaling Peptides and ProteinsBone Morphogenetic ProteinsEctodermIn Situ HybridizationWnt ProteinsCaenorhabditis elegans ProteinsNervous SystemMorphogenesisMolecular Sequence DataFibroblast Growth Factor 8ActivinsDominance, CerebralRhombencephalonAmphibiansNotochordHydraBone Morphogenetic Protein 4Genes, HomeoboxMesencephalonAxisZebrafishProteinsNodal Signaling LigandsHeadBase SequenceSignal TransductionVentricular Function, LeftT-Box Domain ProteinsTissue TransplantationHeartGlycoproteinsLIM-Homeodomain ProteinsMutationMovementInhibinsSilverTransforming Growth Factor betaCell NucleolusNeuronsVentricular Dysfunction, LeftMicroinjectionsMagnetic Resonance ImagingBrainVentricular Function, RightWnt1 ProteinLeft-Right Determination FactorsBrain MappingRepressor ProteinsEndodermAmino Acid SequenceVentricular Dysfunction, RightMetencephalonHuman RightsBlastulaBone Morphogenetic Protein 7Fetal ProteinsHypertrophy, Left VentricularTwins, ConjoinedTrans-ActivatorsFibroblast Growth FactorsCytoskeletal ProteinsBlastodermRNA, MessengerCarrier ProteinsSequence Homology, Amino AcidDNA-Binding ProteinsChick EmbryoMatrix Attachment Region Binding ProteinsSilver Nitratebeta CateninHepatocyte Nuclear Factor 3-betaTectum MesencephaliTime FactorsNeural PlateHeart AtriaAtrial Function, LeftHedgehog ProteinsCloning, Molecular