PLA2R1 and membranous glomerulonephritis: Patients with recurrent membranous nephropathy had significantly higher levels of anti PLA2R1 antibodies in enzyme-linked immunosorbent assay at transplantation than those who did not relapse: 12 (IQR: 2–51) RU/ml versus 2 (IQR: 2–2) RU/ml, P = 0.0002 (Figure 3a and Table 4).