serum beta-2-microglobulin ( beta 2m ) levels , incidence and levels of anti-beta 2m autoantibodies , and quantity of circulating macromolecular complexes containing beta 2m were studied in patients with felty 's syndrome ( fs ) , joint-restricted rheumatoid arthritis ( ra ) , and healthy controls .
C0022417
joint
C0003873
rheumatoid arthritis