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Indoleamine‐2, 3‐dioxygenase‐1 (IDO1) is induced in tumor but not in immune tissues of AT‐2 engrafted rats. A, mRNA levels of Ido1 in spleen, thymus, and tumor. B, IDO1 activities in spleen and tumor. Data are means ± SD (N = 6/group). *P < .05, calculated by Student’s t test. Kyn, kynurenine
