title: Effect of environmental antigen on cholinergic hyperreactivity.
mesh_terms: D000941:Antigens / Q000008:administration & dosage; D001249:Asthma / Q000209:etiology*; D001980:Bronchi / Q000276:immunology*; D004306:Dose-Response Relationship, Immunologic; D004781:Environmental Exposure; D006801:Humans; D008688:Methacholine Compounds / Q000008:administration & dosage / Q000276:immunology; D011058:Pollen; D011950:Receptors, Cholinergic / Q000276:immunology*; D006255:Rhinitis, Allergic, Seasonal / Q000209:etiology*; D012621:Seasons
chemical_list: D000941:Antigens; D008688:Methacholine Compounds; D011950:Receptors, Cholinergic