Supplementary Figure 3. ICOS expression on Tfh and Tfr cells in the peripheral blood has negative or weak correlations with serum IL-21 levels and autoantibody titers in pSS. (A and D) Correlation of intensity of ICOS expression on Tfh and Tfr cells with serum IL-21 levels (n=17). (B and E) Correlation of intensity of ICOS expression on Tfh and Tfr cells with serum anti-SSA/Ro titers (n=18). (C and F) Correlation of intensity of ICOS expression on Tfh and Tfr cells with serum RF titers (n=14). Immune Netw. 2019;19:e23.