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Immunofluorescence. Weak IgA positivity in GBM and mesangial areas. Negative IgG. Weak positivity fine granular IgM. Negative C1q and C3. Moderate positivity for lambda chains with granular aspect. IgA—immunoglobulin A; GBM—glomerular basement membrane; IgG—immunoglobulin G; IgM—immunoglobulin M.
