Inflammation in severe AD mgb−/− kidneys. H&E staining of (A) renal papilla showing atrophic, dilated tubules (AT) surrounded by inflammatory infiltrate, 20X; (B) inflammatory infiltrate in the cortex adjacent to cystic dilation (CY), 40X; (C) abscesses (arrowheads) in the outer cortex, 20X; (D) inflammatory infiltrate in cortex showing plasma cells including Russell bodies (arrowheads), 100X.