Amino AcidsSubstance PSequence Homology, Amino AcidAmino Acid SequenceAmino Acid SubstitutionCloning, MolecularAmino Acids, EssentialAmino Acid Transport SystemsSequence AlignmentBase SequenceSubstance-Related DisordersMutationMolecular Sequence DataEscherichia coliAmino Acid MotifsKineticsBinding SitesMutagenesis, Site-DirectedNeutral RedPeptide FragmentsDNA, ComplementaryProtein ConformationSequence Homology, Nucleic AcidAmino Acids, AromaticRecombinant ProteinsModels, MolecularLeucineAmino Acids, Branched-ChainStructure-Activity RelationshipMolecular WeightSubstrate SpecificityAmino Acids, SulfurPeptidesDNAProtein BindingProtein Structure, TertiaryAmino Acids, NeutralBacterial ProteinsCell LineChromatography, High Pressure LiquidHydrogen-Ion ConcentrationNeutral CeramidasePhylogenyRestriction MappingAlanineElectrophoresis, Polyacrylamide GelProteinsSequence Analysis, DNAReceptors, Neurokinin-1RNA, MessengerSpecies SpecificityAmino Acid Transport Systems, BasicRecombinant Fusion ProteinsGenes, BacterialCattleProtein Structure, SecondarySubstance Abuse Treatment CentersBiological TransportPlasmidsCarrier ProteinsLysineConserved SequenceIsoleucineDNA PrimersTrypsinAmino Acids, BasicGlycineCodonArginineAmino Acids, DiaminoRabbitsGlutamineEvolution, MolecularCyanogen BromideGenesNeprilysinPhenylalanineMethionineValineAspartic AcidChromatography, GelNitrogenTryptophanOpen Reading FramesSaccharomyces cerevisiaeAmino Acid Transport System APolymerase Chain ReactionProtein BiosynthesisProlineHydrolysisCysteineNeutral GlycosphingolipidsMembrane ProteinsEndopeptidasesTransfectionSequence DeletionGene LibraryPoint MutationSequence AnalysisMutagenesis