title: Isolation and preparation of antigens.
mesh_terms: D000542:Alveolitis, Extrinsic Allergic / Q000276:immunology; D000818:Animals; D000941:Antigens / Q000302:isolation & purification*; D001886:Bordetella pertussis / Q000276:immunology; D002499:Centrifugation, Density Gradient; D002850:Chromatography, Gel; D002852:Chromatography, Ion Exchange; D006632:Histamine / Q000378:metabolism; D051379:Mice; D011817:Rabbits
chemical_list: D000941:Antigens; D006632:Histamine