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Renal TMA in a patient with aHUS. Biopsy specimen of renal allograft of patient C.6 after third pregnancy showing (A) arteriolar TMA (acid fuchsin orange G stain, 200× magnification) and (B) glomerular TMA (Periodic Acid-Schiff stain, 200× magnification). In comparison, a renal biopsy after her second pregnancy showed (C) a histologically normal glomerulum with interstitial fibrosis (acid fuchsin orange G stain, 400× magnification).
