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Hepatocellular carcinoma. Immunolabelling TGF-β1 (brown), hematoxylin counterstain. Most neoplastic hepatocytes display moderate cytoplasmic immunoreactivity for TGF-β1. The BPDECs in the adjacent compressed hepatic parenchyma are strongly positive for TGF-β1 as in control liver. Bar = 50 μm 40X.
