title: Seronegative rheumatoid arthritis: tell it as it is.
authors.forename: W W
authors.initials: WW
authors.lastname: Buchanan
authors.forename: D P
authors.initials: DP
authors.lastname: Singal
mesh_terms: D001172:Arthritis, Rheumatoid / Q000097:blood / Q000145:classification / Q000453:epidemiology / Q000235:genetics / Q000276:immunology; D004198:Disease Susceptibility / Q000276:immunology; D020022:Genetic Predisposition to Disease; D006680:HLA Antigens / Q000032:analysis* / Q000235:genetics; D015804:HLA-DR4 Antigen / Q000032:analysis / Q000235:genetics; D006801:Humans; D015995:Prevalence; D012217:Rheumatoid Factor / Q000097:blood*
chemical_list: D006680:HLA Antigens; D015804:HLA-DR4 Antigen; D012217:Rheumatoid Factor