title: Immunoglobulin A and M deficiency in "unclassified" HLA-B27 related arthropathy.
mesh_terms: D006680:HLA Antigens / Q000276:immunology; D006801:Humans; D017098:IgA Deficiency; D007075:Immunoglobulin M / Q000172:deficiency*; D007592:Joint Diseases / Q000276:immunology*; D008297:Male; D008875:Middle Aged
chemical_list: D006680:HLA Antigens; D007075:Immunoglobulin M