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A) Pigmented fibrocellular tissue (Hematoxylin-eosin, Original magnification x 200) B) Pancytokeratin negative fibrocellular tissue (Pancytokeratin, Original magnification x 200) C) Fibrocellular tissue with myofibroblastic differentiation (Smooth muscle actin (SMA), Original magnification x 200) D) Cytokeratin 7 (CK7) positive fibrocellular tissue (CK7, Original magnification x 400)
