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Histological appearance (a) and results of immunohistochemical staining (b–f) of hepatocellular carcinoma. (a) Tumor cells resembling hepatocytes proliferate, showing thick trabecular growth pattern. On immunohistochemistry, the tumor cells are positive for hepatocyte paraffin 1 (b), arginase-1 (c), glypican-3 (d), heat shock protein 70 (e), and glutamine synthetase (GS) (f). (Original magnification: ×200 for (a–f)).
