CD40LG and systemic lupus erythematosus: For the H31–19K9me eluates, IgG Abs were barely detectable in any of the SLE subgroups (Figure 4, F–J), but IgM could be detected in the IgG(1–19low91low)IgM(1–19high91high) and IgG(1–19low91low)IgM(1–19low91high) subgroups, which represented 13.3% of aSLE patients, although the signals were weaker (Figure 5, F and H).