Amino AcidsSequence Homology, Amino AcidAmino Acid SequenceAmino Acid SubstitutionCloning, MolecularAmino Acids, EssentialAmino Acid Transport SystemsStructure-Activity RelationshipBase SequenceMolecular Sequence DataEscherichia coliKineticsSequence AlignmentMutationBinding SitesAmino Acid MotifsModels, MolecularMutagenesis, Site-DirectedProtein ConformationRecombinant ProteinsPeptide FragmentsSubstrate SpecificityDNA, ComplementaryNeutral RedSequence Homology, Nucleic AcidAmino Acids, AromaticProtein BindingMolecular StructureLeucineChromatography, High Pressure LiquidMolecular WeightDNACell LineAmino Acids, Branched-ChainBacterial ProteinsPeptidesAmino Acids, SulfurProtein Structure, TertiaryHydrogen-Ion ConcentrationAmino Acids, NeutralPlasmidsRestriction MappingElectrophoresis, Polyacrylamide GelMagnetic Resonance SpectroscopyNeutral CeramidaseGenes, BacterialPhylogenyAlanineSequence Analysis, DNARecombinant Fusion ProteinsProteinsCattleSpecies SpecificityRNA, MessengerBiological TransportLysineCarrier ProteinsProtein Structure, SecondaryAmino Acid Transport Systems, BasicStereoisomerismDNA PrimersConserved SequenceIsoleucineTrypsinHydrolysisGlycineChemistryMass SpectrometryCodonChemical PhenomenaAmino Acids, BasicAmino Acids, DiaminoTryptophanCysteinePhenylalanineSaccharomyces cerevisiaeGenesArginineRabbitsCyanogen BromideMethionineGlutamineEvolution, MolecularPolymerase Chain ReactionAspartic AcidOpen Reading FramesProtein BiosynthesisProlineValineMutagenesisNitrogenSequence DeletionDNA, BacterialMembrane ProteinsTransfectionChromatography, Thin LayerTemperatureChromatography, GelCatalysisCell Membrane