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Immunohistochemical analysis of human equilibrative nucleoside transporter 1 (hENT1) and ribonucleotide reductase subunit 1 (RRM1) expression in cholangiocarcinoma. These photomicrographs reveal (A) high hENT1 expression, (B) low hENT1 expression, (C) high RRM1 expression, (D) low RRM1 expression (original magnification, × 200; bar=50 μm). Positive internal controls is established by staining of lymphocytes and stromal cells (arrows).
