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(A) Light microscopy shows encircling cellular crescents (periodic acid–Schiff staining). Imunofluorescence shows linear deposition of IgG along the glomerular basement membrane (GBM) (B) and granular deposition of IgA in mesangial spaces (C). (D) Electron microscopy shows a diffusely wrinkled GBM and mesangial electron-dense deposition (arrow) (uranyl acetate/lead citrate staining, ×8,000).
