Amino AcidsSequence Homology, Amino AcidAmino Acid SequenceAmino Acid SubstitutionCloning, MolecularSubstance PAmino Acids, EssentialAmino Acid Transport SystemsSequence AlignmentBase SequenceMolecular Sequence DataEscherichia coliAmino Acid MotifsMutationBinding SitesKineticsMutagenesis, Site-DirectedDNA, ComplementarySequence Homology, Nucleic AcidPeptide FragmentsAmino Acids, AromaticLeucineRecombinant ProteinsProtein ConformationAmino Acids, Branched-ChainModels, MolecularAmino Acids, SulfurStructure-Activity RelationshipNitrogenBacterial ProteinsProtein Structure, TertiarySubstrate SpecificityMolecular WeightProtein BindingPeptidesDNACell LinePhylogenyRestriction MappingSequence Analysis, DNAProteinsAlanineGenes, BacterialElectrophoresis, Polyacrylamide GelRecombinant Fusion ProteinsSpecies SpecificityRNA, MessengerChromatography, High Pressure LiquidCattleAmino Acid Transport Systems, BasicPlasmidsBiological TransportProtein Structure, SecondaryCarrier ProteinsConserved SequenceAmino Acids, NeutralLysineDNA PrimersIsoleucineHydrogen-Ion ConcentrationSubstance-Related DisordersAmino Acids, BasicGlutamineSaccharomyces cerevisiaeCodonTrypsinGlycineDietary ProteinsArginineMethionineProtein BiosynthesisAmino Acids, DiaminoCyanogen BromideGenesPolymerase Chain ReactionOpen Reading FramesValineSwineMembrane ProteinsAmino Acid Transport System APhenylalanineProlineAspartic AcidTranscription, GeneticEvolution, MolecularGene LibrarySequence DeletionTryptophanMutagenesisCulture MediaDietTransfectionNeutral RedSequence AnalysisCysteinePoint MutationExcitatory Amino AcidsRabbitsDNA, BacterialGene Expression