Cellular StructuresOrganizers, EmbryonicNucleolus Organizer RegionCellsGoosecoid ProteinElectron Microscope TomographyMicroscopyBody PatterningMicroscopy, FluorescenceEmbryonic InductionGastrulaOrganellesMicroscopy, Fluorescence, MultiphotonCytoskeletonCell Physiological PhenomenaMicroscopy, ConfocalXenopus ProteinsSilver StainingMicrotubulesStaining and LabelingImaging, Three-DimensionalActinsModels, BiologicalMicroscopy, ElectronEmbryologyGene Expression Regulation, DevelopmentalProteinsMolecular Sequence DataOtx Transcription FactorsEmbryo, NonmammalianNanotechnologyLuminescent ProteinsZebrafish ProteinsHomeodomain ProteinsActin CytoskeletonMicroscopy, Electron, ScanningAmino Acid SequenceXenopusMesodermGreen Fluorescent ProteinsFluorescent DyesSignal TransductionCell LineMicrofilament ProteinsMicrotubule-Associated ProteinsCell MembraneFibroblast Growth Factor 8TubulinNodal ProteinCell NucleusRhombencephalonCytoplasmCell CompartmentationNotochordImage Processing, Computer-AssistedHydraMesencephalonZebrafishCells, CulturedProtein BindingAxisNodal Signaling LigandsIn Situ HybridizationIntercellular Signaling Peptides and ProteinsMembrane ProteinsHeadWnt ProteinsXenopus laevisEctodermProtein TransportBone Morphogenetic ProteinsMutationProteomicsTissue TransplantationNervous SystemNuclear ProteinsHeLa CellsLIM-Homeodomain ProteinsMorphogenesisFluorescent Antibody TechniqueSilverRecombinant Fusion ProteinsTime FactorsImmunohistochemistryCell NucleolusGenes, HomeoboxWnt1 ProteinTranscription FactorsActivinsLeft-Right Determination FactorsEndodermNatureKineticsMitochondriaMetencephalonCell Line, TumorBlastulaFetal ProteinsGlycoproteinsT-Box Domain Proteins