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Indoleamine 2,3‐dioxygenase (IDO) is a Trp‐degrading enzyme that catalyzes the first step in the kynurenine pathway. Two IDO genes, IDO1 and IDO2, are found in vertebrates and the timing of the gene duplication giving rise to the genes has been controversial. In the present study, we report that several fishes and two turtles also have both IDO1 and IDO2. This represents definitive evidence for the...
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