Cellular StructuresOrganizers, EmbryonicGerm LayersNucleolus Organizer RegionCellsGastrulaGoosecoid ProteinBody PatterningEndodermEmbryonic InductionMesodermElectron Microscope TomographyGene Expression Regulation, DevelopmentalMicroscopyXenopus ProteinsEctodermEmbryo, NonmammalianMicroscopy, FluorescenceNeoplasms, Germ Cell and EmbryonalOrganellesMicroscopy, Fluorescence, MultiphotonMicroscopy, ConfocalCytoskeletonNodal Signaling LigandsEmbryonic Stem CellsModels, BiologicalNodal ProteinCell Physiological PhenomenaCell DifferentiationZebrafish ProteinsHomeodomain ProteinsSilver StainingMicroscopy, ElectronStaining and LabelingMolecular Sequence DataMicrotubulesTeratomaIn Situ HybridizationImaging, Three-DimensionalActinsZebrafishSignal TransductionXenopusCell LineGastrulationEmbryologyMorphogenesisGreen Fluorescent ProteinsProteinsEmbryoid BodiesPluripotent Stem CellsAmino Acid SequenceOctamer Transcription Factor-3Xenopus laevisBlastulaCells, CulturedOtx Transcription FactorsMicroscopy, Electron, ScanningNotochordNanotechnologyLuminescent ProteinsNervous SystemSOXB1 Transcription FactorsImmunohistochemistryCell LineageWheat Germ AgglutininsActivinsActin CytoskeletonFluorescent DyesInduced Pluripotent Stem CellsBone Morphogenetic ProteinsEmbryo, MammalianWnt ProteinsMutationTranscription FactorsMicrotubule-Associated ProteinsMicrofilament ProteinsCell MembraneT-Box Domain ProteinsBlastodermHeadFibroblast Growth Factor 8Cell NucleusCytoplasmIntercellular Signaling Peptides and ProteinsMembrane ProteinsTubulinEmbryonic DevelopmentTime FactorsNuclear ProteinsImage Processing, Computer-AssistedRhombencephalonCell CompartmentationGenes, HomeoboxHydraTestisCell Culture TechniquesMesencephalonProtein BindingSpermatogenesis