The resultant effects for these two opposing forces, SLE and thrombosis, are shown in the thrombotic SLE group TS, by which the mean plasma protein levels of C3, C4, C4A, C4B, and ACLA-IgG all fell between those of To and So groups, and their values were closer to those present in the NTS group. Here, C4B is linked to systemic lupus erythematosus.