Amino AcidsSequence Homology, Amino AcidAmino Acid SequenceAmino Acid SubstitutionCloning, MolecularAmino Acids, EssentialAmino Acid Transport SystemsBase SequenceSequence AlignmentMolecular Sequence DataStructure-Activity RelationshipMutationBinding SitesEscherichia coliAmino Acid MotifsKineticsModels, MolecularMutagenesis, Site-DirectedDNA, ComplementaryRecombinant ProteinsPeptide FragmentsProtein ConformationSequence Homology, Nucleic AcidAmino Acids, AromaticProtein BindingSubstrate SpecificityAmino Acids, Branched-ChainCell LineProtein Structure, TertiaryAmino Acids, SulfurLeucineDNAMolecular StructurePeptidesChromatography, High Pressure LiquidMolecular WeightBacterial ProteinsPhylogenyRestriction MappingRNA, MessengerSequence Analysis, DNAProteinsRecombinant Fusion ProteinsElectrophoresis, Polyacrylamide GelAlanineGenes, BacterialSpecies SpecificityPlasmidsProtein Structure, SecondaryCattleLysineMagnetic Resonance SpectroscopyAmino Acid Transport Systems, BasicConserved SequenceDNA PrimersCarrier ProteinsBiological TransportIsoleucineSulfur CompoundsAmino Acids, BasicGlycineAmino Acids, DiaminoArginineStereoisomerismCodonTrypsinSaccharomyces cerevisiaeTranscription, GeneticPolymerase Chain ReactionNitrogenProtein BiosynthesisGlutamineCyanogen BromideMethionineGenesTransfectionOpen Reading FramesCysteineValineAspartic AcidGene LibrarySequence DeletionMutagenesisMembrane ProteinsProlineLiverVolatile Organic CompoundsPoint MutationMass SpectrometryPhenylalanineCells, CulturedSequence AnalysisGene ExpressionHydrogen-Ion ConcentrationExcitatory Amino AcidsDose-Response Relationship, DrugTryptophanHydrolysisRabbitsDNA, Bacterial