IsotopesIsotope LabelingAmino AcidsSequence Homology, Amino AcidNitrogen IsotopesCarbon IsotopesOxygen IsotopesAmino Acid SequenceAmino Acid SubstitutionCloning, MolecularAmino Acids, EssentialAmino Acid Transport SystemsZinc IsotopesSequence AlignmentKineticsSulfur IsotopesEscherichia coliAmino Acid MotifsBase SequenceDeuteriumBinding SitesMutationMolecular Sequence DataMutagenesis, Site-DirectedIron IsotopesLeucineDNA, ComplementaryAmino Acids, AromaticPeptide FragmentsAmino Acids, Branched-ChainSequence Homology, Nucleic AcidModels, MolecularRecombinant ProteinsProtein ConformationAmino Acids, SulfurSubstrate SpecificityStructure-Activity RelationshipPeptidesProtein Structure, TertiaryProtein BindingMass SpectrometryDNAMolecular WeightBacterial ProteinsStrontium IsotopesProteinsPhylogenyRestriction MappingAlanineCell LineSequence Analysis, DNARadioisotope Dilution TechniqueChromatography, High Pressure LiquidRecombinant Fusion ProteinsElectrophoresis, Polyacrylamide GelGenes, BacterialLysineNitrogenRNA, MessengerProtein Structure, SecondarySpecies SpecificityIsoleucineAmino Acid Transport Systems, BasicPlasmidsConserved SequenceAmino Acids, BasicCarrier ProteinsCattleGlycineDNA PrimersBiological TransportTrypsinGlutamineCodonPhenylalanineCatalysisMethionineCyanogen BromideProtein BiosynthesisArginineAspartic AcidValineAmino Acids, DiaminoSaccharomyces cerevisiaeOpen Reading FramesGenesProlineExcitatory Amino AcidsCysteinePolymerase Chain ReactionGene LibrarySequence DeletionSequence AnalysisIndicator Dilution TechniquesLiverTryptophanGas Chromatography-Mass SpectrometryPoint MutationMutagenesisMembrane Proteins