Amino AcidsSequence Homology, Amino AcidAmino Acid SequenceAmino Acid SubstitutionCloning, MolecularAmino Acids, EssentialAmino Acid Transport SystemsSequence AlignmentBase SequenceAmino Acid MotifsEscherichia coliMutationBinding SitesMolecular Sequence DataMutagenesis, Site-DirectedKineticsDNA, ComplementaryAmino Acids, AromaticSequence Homology, Nucleic AcidPeptide FragmentsAmino Acids, Branched-ChainProtein ConformationRecombinant ProteinsLeucineModels, MolecularAmino Acids, SulfurStructure-Activity RelationshipSubstrate SpecificityProtein Structure, TertiaryMolecular WeightDNAPeptidesProtein BindingBacterial ProteinsRestriction MappingCell LinePhylogenyAlanineSequence Analysis, DNAElectrophoresis, Polyacrylamide GelProteinsRecombinant Fusion ProteinsGenes, BacterialAmino Acid Transport Systems, BasicRNA, MessengerAmino Acids, NeutralProtein Structure, SecondaryPlasmidsChromatography, High Pressure LiquidConserved SequenceSpecies SpecificityIsoleucineLysineCarrier ProteinsAmino Acids, BasicDNA PrimersBiological TransportCattleCodonTrypsinGlycineAmino Acids, DiaminoCyanogen BromideGlutamineGenesOpen Reading FramesHydrogen-Ion ConcentrationValineArginineMethionineProtein BiosynthesisAspartic AcidSaccharomyces cerevisiaeNeutral RedNitrogenPhenylalanineExcitatory Amino AcidsPolymerase Chain ReactionAmino Acid Transport System ASequence DeletionGene LibraryProlineSequence AnalysisEvolution, MolecularPoint MutationTryptophanMutagenesisCysteineMembrane ProteinsTransfectionTranscription, GeneticMacromolecular SubstancesDNA, BacterialHydrolysisBlotting, NorthernGene ExpressionEndopeptidasesChromatography, GelRabbitsSequence Analysis, Protein