HistamineHistidineReceptors, Histamine H1Histamine ReleaseReceptors, Histamine H2Receptors, HistamineHistamine AntagonistsHistamine AgonistsHistamine H1 AntagonistsReceptors, Histamine H3Histidine DecarboxylaseHistamine H2 AntagonistsHistamine N-MethyltransferasePyrilamineMethylhistaminesDiethyl PyrocarbonateDimapritHistamine H3 AntagonistsHistamine AgentsHistidine Ammonia-LyaseCimetidineChlorpheniramineMetiamideDiphenhydramineMast Cellsp-Methoxy-N-methylphenethylamineAmino Acid SequenceBasophilsMolecular Sequence DataHydrogen-Ion ConcentrationGuinea PigsImpromidineThioureaBinding SitesMethylhistidinesKineticsAnaphylaxisMutagenesis, Site-DirectedBurimamideATP PhosphoribosyltransferaseHistidinolProtein KinasesUrocanate HydrataseAmino AcidsHistamine H1 Antagonists, Non-SedatingBacterial ProteinsModels, MolecularBronchial Provocation TestsRanitidineDose-Response Relationship, DrugGastric MucosaTriprolidineImmunoglobulin ECarnosineCromolyn SodiumPruritusEscherichia coliMutationProtein ConformationAmine Oxidase (Copper-Containing)TerfenadineImidazolesAcid Anhydride HydrolasesGastric AcidFamotidinePentagastrinGastrinsGastric JuiceSequence Homology, Amino AcidZincSRS-ACetirizineBase SequenceEnterochromaffin-like CellsPeptide PHIFormiminoglutamic AcidRecombinant ProteinsMethacholine CompoundsCatalysisCarboxy-LyasesHemeKetotifenMuscle, SmoothTripelennamineBronchiStructure-Activity RelationshipProtein BindingAnti-Allergic AgentsAirway ResistanceMagnetic Resonance SpectroscopyBronchoconstrictionStomachTracheaEnterochromaffin CellsProtein Structure, TertiaryCloning, MolecularPiperidinesHemeproteinsCrystallography, X-RayPassive Cutaneous Anaphylaxis