Amino AcidsLigandsSequence Homology, Amino AcidAmino Acid SequenceAmino Acid SubstitutionCloning, MolecularBinding SitesMolecular Sequence DataAmino Acids, EssentialAmino Acid Transport SystemsBase SequenceSequence AlignmentKineticsModels, MolecularProtein BindingMutationAmino Acid MotifsProtein ConformationEscherichia coliMutagenesis, Site-DirectedRecombinant ProteinsProtein Structure, TertiaryStructure-Activity RelationshipPeptide FragmentsDNA, ComplementaryCD40 LigandCell LinePeptidesNeutral RedSequence Homology, Nucleic AcidSubstrate SpecificityAmino Acids, AromaticLeucineDNAAmino Acids, Branched-ChainMolecular WeightAmino Acids, SulfurFas Ligand ProteinBacterial ProteinsRecombinant Fusion ProteinsProteinsRNA, MessengerHydrogen-Ion ConcentrationCarrier ProteinsAmino Acids, NeutralProtein Structure, SecondaryAlaninePhylogenyNeutral CeramidaseElectrophoresis, Polyacrylamide GelRestriction MappingSequence Analysis, DNAChromatography, High Pressure LiquidMembrane ProteinsCattleDNA PrimersSpecies SpecificityPlasmidsAmino Acid Transport Systems, BasicConserved SequenceBiological TransportTransfectionGenes, BacterialLysineIsoleucineCells, CulturedSignal TransductionMembrane GlycoproteinsCell MembraneTrypsinGlycineCricetinaeAmino Acids, BasicCodonMolecular StructureCysteineEvolution, MolecularArgininePolymerase Chain ReactionTryptophanPhenylalanineMutagenesisCrystallography, X-RayAmino Acids, DiaminoPoint MutationAspartic AcidGlutamineGene ExpressionBinding, CompetitiveValineCyanogen BromideSequence DeletionMethionineProlineSaccharomyces cerevisiaeGenesTranscription, GeneticProtein BiosynthesisMacromolecular SubstancesCOS Cells