Amino AcidsSequence Homology, Amino AcidAmino Acid SequenceAmino Acid SubstitutionBiological TransportCloning, MolecularKineticsAmino Acid Transport SystemsAmino Acids, EssentialMutationBase SequenceMolecular Sequence DataEscherichia coliSequence AlignmentBinding SitesAmino Acid MotifsHydrogen-Ion ConcentrationLeucineCell LineMutagenesis, Site-DirectedRecombinant ProteinsNeutral RedCarrier ProteinsGlucoseBiological Transport, ActiveDNA, ComplementaryPeptide FragmentsModels, MolecularBacterial ProteinsProtein ConformationStructure-Activity RelationshipProtein BindingSequence Homology, Nucleic AcidAmino Acids, Branched-ChainAmino Acids, AromaticSubstrate SpecificityPeptidesDNAMolecular WeightAmino Acids, NeutralProtein Structure, TertiaryAmino Acids, SulfurTissue DistributionAlanineCell MembraneRNA, MessengerChromatography, High Pressure LiquidLiverRadiopharmaceuticalsPhylogenyElectrophoresis, Polyacrylamide GelAmino Acid Transport Systems, BasicCells, CulturedCattleNeutral CeramidaseRecombinant Fusion ProteinsGenes, BacterialRestriction MappingProteinsSequence Analysis, DNASpecies SpecificityTime FactorsMembrane Transport ProteinsPlasmidsLysineMembrane ProteinsSodiumProtein Structure, SecondaryRabbitsNitrogenGlutamineCarbon RadioisotopesTemperatureDNA PrimersGlycineAminoisobutyric AcidsIsoleucineMethionineProlineAmino Acids, DiaminoDeoxyglucoseConserved SequenceTransfectionIodine RadioisotopesSaccharomyces cerevisiaeAspartic AcidTritiumTrypsinAmino Acids, BasicPositron-Emission TomographyPhenylalanineFluorodeoxyglucose F18CricetinaeAmino Acid Transport System ACodonGlutamic AcidValineSymportersCysteineGene Expression