DNAJB9 and autoimmune disease: A pathophysiologic link between FGN and autoimmune disorders is plausible, considering the presence of IgG4-containing immune complexes in most cases of FGN and the recent discovery of DNAJB9 as a putative autoantigen in FGN [3]. Immunohistochemistry staining for DNAJB9 was not performed in our case, as it was not available.