title: Ankylosing spondylitis. A case positive for rheumatoid factor and HL-A 27 (W 27).
mesh_terms: D003093:Colitis, Ulcerative / Q000150:complications; D006649:Histocompatibility Antigens / Q000032:analysis*; D006801:Humans; D008297:Male; D008875:Middle Aged; D012217:Rheumatoid Factor / Q000032:analysis*; D012218:Rheumatoid Nodule / Q000276:immunology / Q000473:pathology; D013167:Spondylitis, Ankylosing / Q000150:complications / Q000276:immunology*
chemical_list: D006649:Histocompatibility Antigens; D012217:Rheumatoid Factor