Amino AcidsSequence Homology, Amino AcidAmino Acid SequenceAmino Acid SubstitutionCloning, MolecularAmino Acids, EssentialAmino Acid Transport SystemsSequence AlignmentBase SequenceAmino Acid MotifsMolecular Sequence DataEscherichia coliMutationBinding SitesMutagenesis, Site-DirectedDNA, ComplementarySequence Homology, Nucleic AcidPeptide FragmentsKineticsAmino Acids, AromaticRecombinant ProteinsProtein ConformationModels, MolecularAmino Acids, Branched-ChainAmino Acids, SulfurLeucineProtein Structure, TertiaryStructure-Activity RelationshipProtein BindingDNAPeptidesSubstrate SpecificityMolecular WeightBacterial ProteinsCell LineRestriction MappingPhylogenyRecombinant Fusion ProteinsProteinsSequence Analysis, DNARNA, MessengerElectrophoresis, Polyacrylamide GelAlanineGenes, BacterialProtein Structure, SecondaryAmino Acid Transport Systems, BasicPlasmidsConserved SequenceLysineSpecies SpecificityDNA PrimersChromatography, High Pressure LiquidIsoleucineCarrier ProteinsAmino Acids, BasicCattleCodonAmino Acids, DiaminoTrypsinBiological TransportCyanogen BromideArginineGlycineGenesOpen Reading FramesProtein BiosynthesisGlutamineSaccharomyces cerevisiaePolymerase Chain ReactionGene LibrarySequence DeletionValineTranscription, GeneticMethionineSequence AnalysisExcitatory Amino AcidsAspartic AcidMutagenesisTransfectionProlinePoint MutationNitrogenPhenylalanineMembrane ProteinsCysteineTryptophanAmino Acid Transport System AAmino Acids, NeutralGene ExpressionBlotting, NorthernMacromolecular SubstancesEvolution, MolecularViral ProteinsPlant ProteinsDNA-Binding ProteinsDNA, BacterialSequence Analysis, ProteinRabbitsProtein PrecursorsChromatography, Gel