title: Letter: HL-A in farmer's lung.
mesh_terms: D000368:Aged; D005203:Farmer's Lung / Q000276:immunology*; D005260:Female; D006680:HLA Antigens / Q000302:isolation & purification*; D006649:Histocompatibility Antigens / Q000302:isolation & purification*; D006801:Humans; D008168:Lung / Q000276:immunology; D008297:Male; D008875:Middle Aged
chemical_list: D006680:HLA Antigens; D006649:Histocompatibility Antigens