title: Antigenic specificity in a hypersensitivity pneumonitis.
mesh_terms: D000818:Animals; D000917:Antibody Formation; D000941:Antigens; D010856:Columbidae; D006801:Humans; D006969:Hypersensitivity, Immediate / Q000276:immunology*; D005779:Immunodiffusion; D009784:Occupational Diseases / Q000276:immunology; D011014:Pneumonia / Q000276:immunology*; D011233:Precipitin Tests; D012130:Respiratory Hypersensitivity / Q000276:immunology*
chemical_list: D000941:Antigens