Fig. 1From: TGF-β1 expression is associated with invasion and metastasis of intrahepatic cholangiocarcinomaImmunohistochemical staining of TGF-β1 in ICC and normal liver. a TGF-β1 is not expressed in hepatocyte or bile duct. b ICC with negative TGF-β1 staining. c ICC with weak TGF-β1 staining. d ICC with moderate TGF-β1 cytoplasmic staining. e ICC with strong TGF-β1 cytoplasmic staining (×200)Back to article page