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Immunofluorescence microscopy showed granular mesangial and capillary wall staining for (A) IgG and (B) C3. IgG subclasses for (C) IgG1, (D) IgG2, (E) IgG3 and (F) IgG4 showed isolated glomerular staining for IgG3 only. The glomeruli also showed positive staining for (G) kappa light chain, but were negative for (H) lambda light chain (original magnification, 400×).
