In addition, the median percentages of CD19/CD20 double-positive B cells present in peripheral blood lymphocytes of healthy and RA subjects were identified by flow cytometry (Figure 3C) and consisted of 84.8% (IQR 10.2) and 87.0% (IQR 9.7) CD19+/CD20+ B cells in healthy subjects and RA patients, respectively. The gene discussed is CD19; the disease is rheumatoid arthritis.