title: The potency and Group I antigen content of six commercially prepared grass pollen extracts.
mesh_terms: D000941:Antigens / Q000032:analysis; D004592:Electrophoresis, Starch Gel; D006801:Humans; D009584:Nitrogen / Q000032:analysis; D010940:Plant Proteins / Q000032:analysis; D006109:Poaceae; D011058:Pollen / Q000032:analysis*; D006255:Rhinitis, Allergic, Seasonal / Q000276:immunology*; D012882:Skin Tests
chemical_list: D000941:Antigens; D010940:Plant Proteins; D009584:Nitrogen