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<p>In <a href="page.php?w=enzymology">enzymology</a>, <b>tryptophan 2,3-dioxygenase</b>  is a <a href="page.php?w=heme">heme</a> enzyme that catalyzes the oxidation of -<a href="page.php?w=tryptophan">tryptophan</a> (-Trp) to <a href="page.php?w=N%27-Formylkynurenine">''N''-formyl-{{sc</a>, as the first and rate-limiting step of the <a href="page.php?w=kynurenine_pathway">kynurenine pathway</a>.Tryptophan 2,3-dioxygenase plays a central role in the physiological regulation of <a href="page.php?w=tryptophan">tryptophan</a> flux in the human body,</p><p>
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