Amino AcidsSequence Homology, Amino AcidAmino Acid SequenceAmino Acid SubstitutionCloning, MolecularAmino Acids, EssentialAmino Acid Transport SystemsSequence AlignmentAmino Acid MotifsBase SequenceEscherichia coliMutationBinding SitesMutagenesis, Site-DirectedDNA, ComplementaryMolecular Sequence DataAmino Acids, AromaticSequence Homology, Nucleic AcidAmino Acids, Branched-ChainPeptide FragmentsKineticsAmino Acids, SulfurRecombinant ProteinsLeucineProtein ConformationModels, MolecularStructure-Activity RelationshipProtein Structure, TertiaryDNASubstrate SpecificityPeptidesMolecular WeightProtein BindingBacterial ProteinsRestriction MappingCell LinePhylogenySequence Analysis, DNARecombinant Fusion ProteinsAlanineGenes, BacterialProteinsElectrophoresis, Polyacrylamide GelRNA, MessengerAmino Acid Transport Systems, BasicProtein Structure, SecondaryPlasmidsConserved SequenceIsoleucineAmino Acids, BasicLysineSpecies SpecificityChromatography, High Pressure LiquidDNA PrimersCarrier ProteinsCodonCattleCyanogen BromideBiological TransportTrypsinGlycineAmino Acids, DiaminoGlutamineGenesOpen Reading FramesValineProtein BiosynthesisExcitatory Amino AcidsPolymerase Chain ReactionMethionineArginineSaccharomyces cerevisiaeAspartic AcidGene LibrarySequence DeletionSequence AnalysisNitrogenProlinePoint MutationPhenylalanineMutagenesisAmino Acid Transport System AAmino Acids, NeutralTranscription, GeneticCysteineTransfectionMembrane ProteinsTryptophanDNA, BacterialBlotting, NorthernEvolution, MolecularGene ExpressionMacromolecular SubstancesViral ProteinsSequence Analysis, ProteinPlant ProteinsThreonineLiverRabbitsReceptors, Amino Acid