Amino AcidsAmino Acid Transport SystemsReceptors, Purinergic P2X1LeucineSequence Homology, Amino AcidAmino Acid SequenceAmino Acid SubstitutionCloning, MolecularMolecular Sequence DataAmino Acids, EssentialBase SequenceSequence AlignmentMutationProtein Structure, TertiaryAmino Acid MotifsMutagenesis, Site-DirectedBinding SitesEscherichia coliModels, MolecularProtein ConformationMembrane ProteinsKineticsDNA, ComplementaryRecombinant ProteinsProtein Structure, SecondaryPeptide FragmentsStructure-Activity RelationshipProtein BindingCell LineSequence Homology, Nucleic AcidAmino Acids, AromaticRecombinant Fusion ProteinsCell MembranePeptidesAmino Acids, Branched-ChainBacterial ProteinsSubstrate SpecificityAmino Acids, SulfurDNAMolecular WeightRestriction MappingCystic Fibrosis Transmembrane Conductance RegulatorAlanineBiological TransportPhylogenyRNA, MessengerElectrophoresis, Polyacrylamide GelCarrier ProteinsSequence Analysis, DNAConserved SequenceProteinsPlasmidsDNA PrimersGenes, BacterialTransfectionCysteineLysineAmino Acid Transport Systems, BasicSpecies SpecificityIsoleucineCattleHydrogen-Ion ConcentrationAmino Acids, NeutralChromatography, High Pressure LiquidMutagenesisSequence DeletionGlycineCOS CellsPoint MutationAmino Acids, BasicTrypsinCodonAspartic AcidCricetinaeSaccharomyces cerevisiaePolymerase Chain ReactionArginineOpen Reading FramesProtein BiosynthesisGene LibraryGlutamineProlinePhenylalanineCyanogen BromideAmino Acids, DiaminoGenesValineTryptophanGene ExpressionMethionineEvolution, MolecularSequence AnalysisMacromolecular SubstancesProtein Sorting SignalsEndopeptidasesTranscription, GeneticRabbitsHydrolysisNitrogenBlotting, Northern