Amino AcidsSequence Homology, Amino AcidAmino Acid SequenceAmino Acid SubstitutionCloning, MolecularAmino Acids, EssentialAmino Acid Transport SystemsBiological TransportSequence AlignmentKineticsBase SequenceEscherichia coliAmino Acid MotifsMutationBinding SitesMolecular Sequence DataMutagenesis, Site-DirectedDNA, ComplementaryLeucineAmino Acids, AromaticRecombinant ProteinsSequence Homology, Nucleic AcidAmino Acids, Branched-ChainPeptide FragmentsAmino Acids, SulfurProtein ConformationModels, MolecularStructure-Activity RelationshipCell LineBacterial ProteinsProtein BindingProtein Structure, TertiaryPeptidesSubstrate SpecificityDNACarrier ProteinsMolecular WeightRestriction MappingAlanineRNA, MessengerRecombinant Fusion ProteinsGenes, BacterialPhylogenySequence Analysis, DNAProteinsElectrophoresis, Polyacrylamide GelAmino Acid Transport Systems, BasicPlasmidsChromatography, High Pressure LiquidGlucoseLysineProtein Structure, SecondarySpecies SpecificityBiological Transport, ActiveIsoleucineConserved SequenceDNA PrimersCattleAmino Acids, BasicLiverGlutamineGlycineNitrogenMethionineAmino Acids, DiaminoCell MembraneTissue DistributionMembrane ProteinsCodonTrypsinProlineSaccharomyces cerevisiaeAspartic AcidCyanogen BromideValineTransfectionOpen Reading FramesProtein BiosynthesisHydrogen-Ion ConcentrationGenesCells, CulturedPhenylalaninePolymerase Chain ReactionExcitatory Amino AcidsRabbitsSequence DeletionAmino Acids, NeutralGene LibraryCysteineMembrane Transport ProteinsArginineAmino Acid Transport System AMutagenesisAminoisobutyric AcidsSequence AnalysisTranscription, GeneticPoint MutationGene ExpressionTryptophanDNA, Bacterial