Fig. 2From: Syphilis-related rapidly progressive glomerulonephritis: a case presentationa Light microscopy of the kidney biopsy core with significant interstitial plasma cell and eosinophil infiltration. H&E 40X. b IgG Immunohistochemistry staining. c IgG4 subclass immunohistochemisty staining (accounting for ~ 50% of IgG staining)Back to article page