Allograft kidney. (A) Tubular epithelial blebs, vacuolization, focal tubulitis, and mononuclear inflammatory interstitial infiltrate, 45 weeks post-transplant (hematoxylin and eosin staining). (B) Granular IgG staining of TBMs, 45 weeks post-transplant. (C) Large amorphous electron-dense deposits along the TBM, 7 weeks post-transplant; similar deposits are present at 45 weeks. (D) Rare amorphous subepithelial electron-dense deposits along the GBM, 45 weeks post-transplant. Original magnification, ×400 in A and B; ×14,000 in C; ×18,000 in D.