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Histology of the kidney showing membranous glomerulonephritis. (A) Thickening of basement membranes, enlarged mesangial areas, and proliferated mesangial cells in part (PAS stain). (B) Spike lesions (arrows; PAM stain). (C) Electron microscopic observation showing electron-dense deposits in the subepithelium, basement membranes (arrowheads), and mesangial area (arrow).
