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Chronic rejection: (A) low power view shows atretic portal tracts (red circles) and an area of foamy degeneration, (B) immunohistochemistry (CK 19) image showing CK 19 staining in only 1 (upper) out of 3 portal tracts (marked by red circles), (C) focal CK19 staining (degenerating duct), (D) no CK19 staining is visible in this portal tract (within red circle).
