Fig. 1From: Association of anti-peptidyl arginine deiminase antibodies with radiographic severity of rheumatoid arthritis in African AmericansBlood samples and radiographs of patients with RA from the CLEAR I and CLEAR II cohorts. CLEAR I is a longitudinal registry of African-American patients with early RA. CLEAR II is a cross-sectional registry of African-American patients with established RA. CLEAR Consortium for the Longitudinal Evaluation of African Americans with Early Rheumatoid ArthritisBack to article page