Figure 1: Representative renal biopsy specimens using various staining methods of IgA in mesangioproliferative glomerulonephritis. (a) Immunofluorescence on frozen sections (×600). (b) Immunoperoxidase on formalin-fixed, paraffin-embedded tissue sections (×400). (c) Immunofluorescence on formalin-fixed, paraffin-embedded tissue sections (×400)