Cellular StructuresOrganizers, EmbryonicNucleolus Organizer RegionCellsGoosecoid ProteinElectron Microscope TomographyMicroscopyBody PatterningMicroscopy, FluorescenceEmbryonic InductionGastrulaMicroscopy, Fluorescence, MultiphotonOrganellesCytoskeletonCell Physiological PhenomenaMicroscopy, ConfocalXenopus ProteinsSilver StainingMicrotubulesImaging, Three-DimensionalStaining and LabelingActinsModels, BiologicalMicroscopy, ElectronEmbryologyGene Expression Regulation, DevelopmentalMolecular Sequence DataProteinsOtx Transcription FactorsEmbryo, NonmammalianNanotechnologyLuminescent ProteinsZebrafish ProteinsHomeodomain ProteinsActin CytoskeletonAmino Acid SequenceMicroscopy, Electron, ScanningGreen Fluorescent ProteinsXenopusMesodermFluorescent DyesSignal TransductionCell LineMicrofilament ProteinsMicrotubule-Associated ProteinsFibroblast Growth Factor 8Cell MembraneTubulinNodal ProteinCell NucleusRhombencephalonCytoplasmNotochordCell CompartmentationImage Processing, Computer-AssistedHydraCells, CulturedMesencephalonAxisZebrafishNodal Signaling LigandsMutationIntercellular Signaling Peptides and ProteinsHeadProtein BindingIn Situ HybridizationWnt ProteinsMembrane ProteinsTime FactorsXenopus laevisProtein TransportBone Morphogenetic ProteinsEctodermProteomicsTissue TransplantationNuclear ProteinsNervous SystemHeLa CellsLIM-Homeodomain ProteinsRecombinant Fusion ProteinsMorphogenesisFluorescent Antibody TechniqueImmunohistochemistrySilverCell NucleolusGenes, HomeoboxWnt1 ProteinTranscription FactorsActivinsLeft-Right Determination FactorsEndodermCell Line, TumorMitochondriaMetencephalonKineticsBlastulaFetal ProteinsT-Box Domain ProteinsGlycoproteinsTwins, Conjoined