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Organizers, EmbryonicNucleolus Organizer RegionBody PatterningGoosecoid ProteinNodal ProteinGene Expression Regulation, DevelopmentalFunctional LateralityEmbryonic InductionGastrulaXenopus ProteinsHomeodomain ProteinsSilver StainingGenes, HelminthCaenorhabditis elegansEmbryologyOtx Transcription FactorsEmbryo, NonmammalianZebrafish ProteinsCaenorhabditis elegans ProteinsTranscription FactorsMesodermXenopusFibroblast Growth Factor 8Dominance, CerebralRhombencephalonNotochordHydraMesencephalonAxisZebrafishNodal Signaling LigandsHeadIn Situ HybridizationIntercellular Signaling Peptides and ProteinsWnt ProteinsVentricular Function, LeftEctodermXenopus laevisBone Morphogenetic ProteinsMolecular Sequence DataTissue TransplantationHeartNervous SystemLIM-Homeodomain ProteinsMorphogenesisMutationMovementSilverBase SequenceCell NucleolusNeuronsVentricular Dysfunction, LeftMagnetic Resonance ImagingBrainGenes, HomeoboxVentricular Function, RightWnt1 ProteinLeft-Right Determination FactorsBrain MappingActivinsSignal TransductionEndodermVentricular Dysfunction, RightMetencephalonHuman RightsBlastulaT-Box Domain ProteinsFetal ProteinsHypertrophy, Left VentricularTwins, ConjoinedGlycoproteinsProteinsFibroblast Growth FactorsBlastodermChick EmbryoMatrix Attachment Region Binding ProteinsBone Morphogenetic Protein 4Silver NitrateTransforming Growth Factor betabeta CateninHepatocyte Nuclear Factor 3-betaAmphibiansRepressor ProteinsInhibinsTectum MesencephaliTime FactorsAmino Acid SequenceNeural PlateTrans-ActivatorsHeart AtriaAtrial Function, LeftHedgehog ProteinsDrug PackagingProsencephalonChromosomesStaining and LabelingMicroinjectionsEchocardiographyNerve Tissue ProteinsBlastomeres