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Immunohistochemical staining for Foxp3 + Treg and IDO expression in gastric cancer tissues (×400): (A) Foxp3 + Treg was high (positive cell staining index = 2.9%); (B) Foxp3 + Treg was low (positive cell staining index = 0.2%). (C) IDO expression was positive. (D) IDO expression was negative
