a The percentages of CD19+ B cells, CD19+CD27+ B cells, and CD19+CD20+ B cells were analyzed by flow cytometry. b The percentage of CD19+CD20+CD27+ B cells was analyzed by flow cytometry. c The percentages of CD19+ B cells, CD19+CD27+ B cells, CD19+CD20+ B cells, and CD19+CD20+CD27+ B cells were increased significantly in the BAFF stimulation group compared with the control group. *P < 0.05 vs. control.