Biological Transport, Active3-IodobenzylguanidineOrganic Anion TransportersBiological TransportKineticsRadiopharmaceuticalsGlucoseDeoxyglucoseFluorodeoxyglucose F18Iodine RadioisotopesPositron-Emission TomographyTissue DistributionFluorine RadioisotopesMembrane Transport ProteinsCarbon RadioisotopesSodiumCarrier ProteinsLiverHydrogen-Ion ConcentrationIronCells, CulturedEndocytosisTime FactorsCell MembraneNeurotransmitter Uptake InhibitorsTritiumSymportersIodobenzenesGallium RadioisotopesTomography, Emission-ComputedOrganotechnetium CompoundsCell LineTechnetiumInsulinMonosaccharide Transport ProteinsTransferrinPotassiumDose-Response Relationship, DrugMuscle, SkeletalLactic AcidRats, Sprague-DawleyRats, Inbred Strains