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Microscopic features of autopsy kidney (left: periodic acid‐Schiff reaction, right: IgM immunostaining after prolonged protease‐1 digestion). Mesangial cell growth or increase of mesangial matrix is scarcely noted. Immunostaining after prolonged protease‐1 digestion of formalin‐fixed, paraffin‐embedded sections shows mesangial deposition of IgM
