Immunohistochemistry staining for PLA2R, THSD7A and NELL-1 was performed as previously described [9,13,14]. The rabbit anti-human PLA2R polyclonal antibody (1:800; Sigma-Aldrich), the rabbit anti-human THSD7A polyclonal antibody (1:1500; Sigma Chemical Company and the rabbit polyclonal anti–NELL-1 antibody (1:800; Sigma Chemical Company) were the primary antibodies. The serum anti-PLA2R antibody levels were detected by ELISA (EUROIMMUN, Lübeck, Germany). The results were considered positive at ≥ 20 relative units (RU)/mL.
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