Quaternary Ammonium CompoundsMesylatesProtein Structure, QuaternaryEthyl MethanesulfonateCysteineDiphenylhexatrieneSulfhydryl ReagentsCetrimonium CompoundsFatty Acids, MonounsaturatedIndicators and ReagentsCationsSurface-Active AgentsStructure-Activity RelationshipParasympathomimeticsProtein ConformationModels, MolecularKineticsLiposomesMutagenesis, Site-DirectedProtein Structure, TertiaryBinding SitesProtein BindingAmino Acid SubstitutionMolecular Sequence DataXenopus laevisIon Channel GatingAmino Acid SequenceAcetylcholineOocytesXenopusMembrane PotentialsBiological TransportCell MembraneMutationMolecular StructureSodiumPatch-Clamp TechniquesStereoisomerismCrystallography, X-RayBenzalkonium CompoundsSulfur CompoundsMagnetic Resonance SpectroscopyMacromolecular SubstancesHemoglobin AVolatile Organic CompoundsDimerizationCarboxyhemoglobinAllosteric RegulationProtein MultimerizationDisinfectantsHeterocyclic CompoundsHemoglobinsChromatography, High Pressure LiquidMolecular ConformationAllyl CompoundsSpiro CompoundsEscherichia coliPhenolsCatalysisSulfhydryl CompoundsHydrogen-Ion ConcentrationPlant ExtractsDrug Evaluation, PreclinicalModels, ChemicalLigandsInhibitory Concentration 50Spectrophotometry, UltravioletCetylpyridiniumDose-Response Relationship, DrugOrganometallic CompoundsBiphenyl CompoundsMass SpectrometryOxyhemoglobinsOrganophosphorus CompoundsSmall Molecule LibrariesCyclizationDecamethonium CompoundsPalladiumProtein Structure, SecondaryX-Ray DiffractionOrganotin CompoundsCircular DichroismScattering, RadiationOxidation-ReductionDrug DesignAniline CompoundsKetonesChemistryNitrogen CompoundsBacterial ProteinsChemical PhenomenaCross-Linking ReagentsRecombinant ProteinsSpectrometry, Mass, Electrospray IonizationSubstrate SpecificityMolecular WeightChromatography, GelSolutionsAspartate CarbamoyltransferaseMethemoglobin