| http://www.w3.org/ns/prov#value | - One mechanism of immune escape that has been linked to cancer is elevation of the tryptophan-catabolizing enzyme, indoleamine 2,3-dioxygenase (IDO1) [5???14].IDO1 can be expressed in many tissue and cell types, such as placenta, lung, gut, and epididymis [13, 15???17].
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