Amino AcidsSequence Homology, Amino AcidAmino Acid SequenceAmino Acid SubstitutionCloning, MolecularAmino Acids, EssentialAmino Acid Transport SystemsSequence AlignmentBase SequenceAmino Acid MotifsMutationEscherichia coliMolecular Sequence DataBinding SitesMutagenesis, Site-DirectedDNA, ComplementarySequence Homology, Nucleic AcidAmino Acids, AromaticKineticsPeptide FragmentsAmino Acids, Branched-ChainRecombinant ProteinsAmino Acids, SulfurLeucineProtein ConformationModels, MolecularStructure-Activity RelationshipProtein Structure, TertiaryDNAPhylogenyProtein BindingSubstrate SpecificityBacterial ProteinsPeptidesMolecular WeightSpecies SpecificitySequence Analysis, DNACell LineRestriction MappingRNA, MessengerRecombinant Fusion ProteinsProteinsGenes, BacterialAlanineElectrophoresis, Polyacrylamide GelConserved SequencePlasmidsChromatography, High Pressure LiquidProtein Structure, SecondaryAmino Acid Transport Systems, BasicDNA PrimersCarrier ProteinsIsoleucineLysineAmino Acids, BasicCattleCodonPolymerase Chain ReactionBiological TransportGlycineCyanogen BromideTrypsinOpen Reading FramesGlutamineGenesArginineAmino Acids, DiaminoValineProtein BiosynthesisMethionineSaccharomyces cerevisiaeSequence DeletionGene LibraryEvolution, MolecularExcitatory Amino AcidsNitrogenSequence AnalysisAspartic AcidPoint MutationMembrane ProteinsMutagenesisPhenylalanineProlineTranscription, GeneticTransfectionDNA, BacterialCysteineGene ExpressionTryptophanAmino Acid Transport System AAmino Acids, NeutralLiverSwineBlotting, NorthernRabbitsViral ProteinsMacromolecular SubstancesSequence Analysis, ProteinEpitopesPlant Proteins