TNFRSF13C and peeling skin syndrome: Regarding the percentages of BAFF-R expression on memory B cells, there was no difference among IgG4-RD, pSS, and HC (IgG4-RD: 82.78 ± 21.63%; pSS: 86.06 ± 10.35%; HC: 90.21 ± 10.08%; P = 0.30; Figure 2E).