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Expression of arginase-1 and CK19 in HCC. (a) High arginase-1 expression (× 200). (b) Low arginase-1 expression (× 200). (c) Arginase-1 is highly expressed in adjacent benign liver (× 12.5). (d) Positive CK19 expression (× 200). (e) Negative CK19 expression (× 200). (f) CK19 expression in adjacent benign bile duct epithelium (× 200). CK19: cytokeratin 19; HCC: hepatocellular carcinoma.
