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Immunohistochemistry of the kidney biopsy. Immunohistochemistry stainings (magnification x400) with antisera against IgA (A), IgG (B), IgM with mild mesangial staining (C, arrow), C1q (D), and C3c (E) showed only mild background staining at the endothelial aspect of the capillary loops without deposits suspicious of immune-complex glomerulonephritis.
