Amino AcidsSequence Homology, Amino AcidAmino Acid SequenceAmino Acid SubstitutionCloning, MolecularMolecular Sequence DataBase SequenceAmino Acids, EssentialAmino Acid Transport SystemsBinding SitesSequence AlignmentKineticsMutationEscherichia coliMutagenesis, Site-DirectedAmino Acid MotifsPeptide FragmentsProtein ConformationRecombinant ProteinsStructure-Activity RelationshipModels, MolecularDNA, ComplementaryProtein Structure, TertiaryProtein BindingSubstrate SpecificitySequence Homology, Nucleic AcidMolecular WeightPeptidesNeutral RedLeucineCell LineDNAHydrogen-Ion ConcentrationAmino Acids, AromaticAmino Acids, Branched-ChainRecombinant Fusion ProteinsBacterial ProteinsRestriction MappingAmino Acids, SulfurElectrophoresis, Polyacrylamide GelAlanineChromatography, High Pressure LiquidAmino Acids, NeutralProtein Structure, SecondaryPlasmidsCattlePhylogenyNeutral CeramidaseProteinsCarrier ProteinsRNA, MessengerSequence Analysis, DNAGenes, BacterialLysineConserved SequenceDNA PrimersTrypsinBiological TransportAspartic AcidSpecies SpecificitySequence DeletionAmino Acid Transport Systems, BasicTransfectionGlycineIsoleucineCyanogen BromideCysteineEndopeptidasesMembrane ProteinsHydrolysisSaccharomyces cerevisiaeCodonCell MembraneMacromolecular SubstancesMutagenesisArginineGenesCarboxyl and Carbamoyl TransferasesMethionineGlutamineProlinePoint MutationProtein BiosynthesisProtein O-MethyltransferasePolymerase Chain ReactionAmino Acids, BasicSequence AnalysisOpen Reading FramesChromatography, GelEvolution, MolecularGene LibraryAmino Acids, DiaminoValinePhenylalanineRabbitsTryptophanTranscription, GeneticMagnetic Resonance SpectroscopyCOS CellsCatalysis