C5b-9 colocalized with immune deposits containing IgG, C3, and sometimes C1q and C4 in the capillary wall in all stages of primary membranous nephropathy (44, 67, 70, 72, 75, 77, 81, 82, 87, 96, 112, 139, 143, 147–149, 152, 154–156), except for stage I according to one report (72). The gene discussed is C4A; the disease is membranous glomerulonephritis.