title: Regulatory control and standardization of allergenic extracts. Standardized extracts in therapy.
mesh_terms: D000485:Allergens / Q000592:standards*; D003888:Desensitization, Immunologic; D004311:Double-Blind Method; D004341:Drug Evaluation; D006801:Humans; D010919:Placebos; D011058:Pollen; D006255:Rhinitis, Allergic, Seasonal / Q000628:therapy*
chemical_list: D000485:Allergens; D010919:Placebos