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Quantities of the C5 and membrane attack complex (MAC) present on circulating immune complexes (CIC) as measured using enzyme-linked immunosorbent assay (ELISA)-based assays. A strong correlation was observed between these late complement components. C5 levels were lower than the detection limit of the assay in 16 patients. The amount of C5 is represented on the left axis in ng/ml, while the amount of MAC on CIC is represented on the right axis as OD at 450 nm.
