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α-Smooth muscle actin and smoothelin expression in hepatocellular carcinoma. A and B: α-smooth muscle actin (A) and smoothelin (B) are expressed similarly in the stroma reaction surrounding the tumor (arrows) and around tumoral hepatocytes; C and D: α-smooth muscle actin (C) and smoothelin (D) are expressed by pericyte-like cells underlying capillaries between tumoral hepatocytes.
