Amino AcidsAmino Acid Transport SystemsReceptors, Purinergic P2X1LeucineSequence Homology, Amino AcidAmino Acid SequenceCloning, MolecularMolecular Sequence DataMammalsAmino Acid SubstitutionCell LineBase SequenceMutationSequence AlignmentCricetinaeKineticsRecombinant ProteinsBinding SitesAmino Acids, EssentialEscherichia coliDNADNA, ComplementaryProtein BindingAmino Acid MotifsHeLa CellsTransfectionProtein Structure, TertiaryRecombinant Fusion ProteinsMutagenesis, Site-DirectedSequence Homology, Nucleic AcidPlasmidsSubstrate SpecificityRNA, MessengerModels, MolecularCarrier ProteinsProtein ConformationProteinsCHO CellsStructure-Activity RelationshipMolecular WeightPeptide FragmentsCOS CellsPeptidesNeutral RedSpecies SpecificityElectrophoresis, Polyacrylamide GelPhylogenyCells, CulturedSaccharomyces cerevisiaeBacterial ProteinsDNA PrimersBiological TransportCercopithecus aethiopsTranscription, GeneticAmino Acids, AromaticCattleRestriction MappingConserved SequenceMembrane ProteinsHydrogen-Ion ConcentrationAmino Acids, Branched-Chain