FCGR3A and rheumatoid arthritis: To gain insight into the molecular differences between RA and Ctrl samples, we further classified monocytes into classic monocytes (CD14+, CD16−) and nonclassic monocytes (CD14+, CD16+) based on the expression of CD14 and CD16 in the cells (Figures 3(a) and 3(b), Supplementary 13).