CD40LG and rheumatoid arthritis: We did not find any significant difference between the ratios of EndoCAb IgG:total IgG (P = 0.194), EndoCAb IgA:total IgA (P = 0.697), and EndoCAb IgM:total IgM (P = 0.528) in RA subjects compared to healthy controls (Figures 4G–I).