Amino AcidsSequence Homology, Amino AcidAmino Acid SequenceAmino Acid SubstitutionCloning, MolecularAmino Acids, EssentialAmino Acid Transport SystemsBase SequenceSequence AlignmentComplex MixturesMolecular Sequence DataEscherichia coliAmino Acid MotifsBinding SitesMutationKineticsMutagenesis, Site-DirectedPeptide FragmentsDNA, ComplementaryRecombinant ProteinsSequence Homology, Nucleic AcidModels, MolecularProtein ConformationAmino Acids, AromaticAmino Acids, Branched-ChainLeucineStructure-Activity RelationshipProtein BindingPeptidesAmino Acids, SulfurDNAMolecular WeightProtein Structure, TertiarySubstrate SpecificityBacterial ProteinsCell LineProteinsChromatography, High Pressure LiquidElectrophoresis, Polyacrylamide GelRestriction MappingPhylogenySequence Analysis, DNARecombinant Fusion ProteinsRNA, MessengerAlanineCattleGenes, BacterialPlasmidsProtein Structure, SecondaryLysineSpecies SpecificityAmino Acid Transport Systems, BasicConserved SequenceDNA PrimersIsoleucineCarrier ProteinsTrypsinAmino Acids, BasicBiological TransportCodonAmino Acids, DiaminoPolymerase Chain ReactionCyanogen BromideGlycineArginineNitrogenProtein BiosynthesisGenesSaccharomyces cerevisiaeGlutamineOpen Reading FramesMethionineValineTranscription, GeneticGene LibrarySequence DeletionSequence AnalysisPhenylalanineAspartic AcidMacromolecular SubstancesTransfectionProlineMutagenesisMembrane ProteinsPoint MutationCysteineExcitatory Amino AcidsTryptophanRabbitsHydrogen-Ion ConcentrationTemperatureGene ExpressionHydrolysisChromatography, GelLiverDNA, BacterialSwineViral ProteinsPlant ProteinsEvolution, Molecular