1. Rheumatoid arthritis patients will meet American College of Rheumatology revised criteria (Arnett, Edworthy et al. 1988). This requires at least four of the following seven criteria: 1) morning joint stiffness; 2) arthritis in 3 or more joint areas; 3) arthritis of hand joints; 4) symmetric arthritis; 5) rheumatoid nodules; 6) presence of serum rheumatoid factor and 7) changes on posteroanterior hand and wrist radiographs. In addition, criteria 1-4 must be present for at least four weeks. Subjects must be between 18 and 85 years of age.