Figure 2From: Enhanced late-outgrowth circulating endothelial progenitor cell levels in rheumatoid arthritis and correlation with disease activityPositive correlation between endothelial progenitor cell (EPC) counts and circulating endothelial cell (CEC) counts (cells per 106 lineage-negative mononuclear cells). (a) Patients with rheumatoid arthritis. (b) Controls. Correlation coefficient r and P values are indicated.Back to article page