TNFRSF13C and systemic lupus erythematosus: The same trend was observed for the BR3 MFI in HVs (116.78 ± 17.76 vs. 125.43 ± 22.34; p = 0.0020) and SLE patients (104.53 ± 19.90 vs. 112.83 ± 22.86; p = 0.0032) (Figure 3B(c)).