Amino AcidsSequence Homology, Amino AcidAmino Acid SubstitutionCloning, MolecularAmino Acids, EssentialAmino Acid Transport SystemsAmino Acid MotifsSequence AlignmentBase SequenceEscherichia coliMutationBinding SitesMolecular Sequence DataAmino Acids, AromaticMutagenesis, Site-DirectedAmino Acids, SulfurDNA, ComplementarySequence Homology, Nucleic AcidPeptide FragmentsKineticsProtein ConformationRecombinant ProteinsLeucineModels, MolecularStructure-Activity RelationshipProtein Structure, TertiarySubstrate SpecificityProtein BindingDNAPeptidesMolecular WeightBacterial ProteinsAmino Acid SequenceRestriction MappingCell LineRecombinant Fusion ProteinsAlaninePhylogenyGenes, BacterialProteinsSequence Analysis, DNAElectrophoresis, Polyacrylamide GelAmino Acid Transport Systems, BasicRNA, MessengerPlasmidsProtein Structure, SecondaryLysineAmino Acids, BasicConserved SequenceIsoleucineChromatography, High Pressure LiquidAmino Acid Transport Systems, NeutralSpecies SpecificityCarrier ProteinsDNA PrimersAmino Acids, DiaminoCodonTrypsinCyanogen BromideCattleBiological TransportExcitatory Amino AcidsAmino Acyl-tRNA SynthetasesGlycineAmino SugarsGlutamineGenesProtein BiosynthesisOpen Reading FramesValineMethionineArginineSaccharomyces cerevisiaeSequence DeletionAspartic AcidNitrogenGene LibraryPolymerase Chain ReactionAmino Acid Transport System ASequence AnalysisProlineAmino Acids, NeutralMutagenesisPoint MutationCysteineTransfectionTranscription, GeneticMembrane ProteinsTryptophanLarge Neutral Amino Acid-Transporter 1Macromolecular SubstancesDNA, BacterialReceptors, Amino AcidBlotting, NorthernViral ProteinsGene ExpressionGlutamatesRNA, Transfer, Amino AcylEvolution, MolecularSequence Analysis, Protein