Cellular StructuresOrganizers, EmbryonicNucleolus Organizer RegionCellsGoosecoid ProteinElectron Microscope TomographyMicroscopyBody PatterningEmbryonic InductionMicroscopy, FluorescenceGastrulaOrganellesMicroscopy, Fluorescence, MultiphotonCytoskeletonCell Physiological PhenomenaMicroscopy, ConfocalXenopus ProteinsSilver StainingMicrotubulesImaging, Three-DimensionalStaining and LabelingActinsMicroscopy, ElectronModels, BiologicalEmbryologyGene Expression Regulation, DevelopmentalOtx Transcription FactorsProteinsEmbryo, NonmammalianNanotechnologyZebrafish ProteinsLuminescent ProteinsMolecular Sequence DataHomeodomain ProteinsActin CytoskeletonXenopusMesodermMicroscopy, Electron, ScanningGreen Fluorescent ProteinsFluorescent DyesSignal TransductionMicrofilament ProteinsMicrotubule-Associated ProteinsAmino Acid SequenceCell LineFibroblast Growth Factor 8Cell MembraneTubulinNodal ProteinRhombencephalonNotochordCell NucleusCell CompartmentationCytoplasmHydraImage Processing, Computer-AssistedMesencephalonAxisNodal Signaling LigandsZebrafishIntercellular Signaling Peptides and ProteinsWnt ProteinsHeadIn Situ HybridizationCells, CulturedEctodermXenopus laevisBone Morphogenetic ProteinsMembrane ProteinsProtein TransportProtein BindingProteomicsTissue TransplantationNervous SystemNuclear ProteinsLIM-Homeodomain ProteinsHeLa CellsMutationMorphogenesisSilverFluorescent Antibody TechniqueRecombinant Fusion ProteinsCell NucleolusImmunohistochemistryGenes, HomeoboxTime FactorsWnt1 ProteinActivinsLeft-Right Determination FactorsTranscription FactorsEndodermMetencephalonMitochondriaBlastulaFetal ProteinsCell Line, TumorT-Box Domain ProteinsGlycoproteinsTwins, ConjoinedFibroblast Growth Factors