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Expression of indoleamine 2,3-dioxygenase (IDO) in nasopharyngeal carcinoma. Normal nasopharyngeal tissue (A), tumor section from NPC type I (B), type II (C) and type III (D) were stained with antibodies to IDO, as described in Materials and Methods. Images were captured at ×100 magnification, and ×400 magnification for inserts.
