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Histopathology of intestinal mucosal pinch biopsies of (A) small intestine with chronic, idiopathic enterocolitis, (B) small intestine with amyloidosis, (C) colon with chronic, idiopathic entercolitis, and (D) colon with amyloidosis. Amyloid protein is homogenous, amorphous, eosinophilic, and indicated by black arrows. Hematoxylin and eosin stain; bar, 20 µm.
