Fluorescent DyesFluoresceinsRhodaminesAmidinesPlasmodesmataFluoresceinCarbocyaninesAxonal TransportDextransFluorescein-5-isothiocyanateGap JunctionsRetinal Ganglion CellsMicroscopy, FluorescenceIsoquinolinesConnexinsDiffusionNeuronsNeural PathwaysSpinal CordRats, Sprague-DawleyHair DyesColoring AgentsRosaniline DyesRadiopharmaceuticalsFluorine RadioisotopesCarbon RadioisotopesPositron-Emission TomographyTomography, Emission-ComputedIsotope LabelingVoltage-Sensitive Dye ImagingOrganotechnetium CompoundsRadioisotopesIodine RadioisotopesAmaranth DyeRadioisotope Dilution TechniqueTissue DistributionDye Dilution TechniqueLissamine Green DyesNeuronal Tract-TracersCarbon IsotopesHorseradish PeroxidasePyridinium CompoundsStaining and LabelingFluorodeoxyglucose F18Tomography, Emission-Computed, Single-PhotonTechnetiumKineticsCopper RadioisotopesRadiochemistryFood Coloring AgentsMetabolic Clearance RateSerum Albumin, Radio-IodinatedNitrogen RadioisotopesNeuroanatomical Tract-Tracing TechniquesThiosemicarbazonesBiological TransportBrainWheat Germ Agglutinin-Horseradish Peroxidase ConjugateStilbamidinesTime FactorsCapillary PermeabilityIodobenzenesModels, BiologicalAutoradiographyGallium RadioisotopesDeuteriumOximesIsotopesAir MovementsOxygen RadioisotopesIndicator Dilution TechniquesNitrogen IsotopesOrganometallic CompoundsMolecular ImagingBiotinDeoxyglucoseIofetamineZinc IsotopesBromphenol BlueHeartTritiumTechnetium Tc 99m SestamibiXanthenesCell Membrane PermeabilityImage Processing, Computer-AssistedTechnetium Tc 99m Aggregated AlbuminGlucoseFluorescenceRadionuclide ImagingSensitivity and SpecificityTechnetium Tc 99m MedronateReproducibility of ResultsThorium DioxideMicroscopy, ElectronMethylene BlueTechnetium Tc 99m ExametazimeLeucineDogsRabbitsMicrospheres