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. 2018 Feb 19;11:1178646917753422. doi: 10.1177/1178646917753422

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© The Author(s) 2018

This article is distributed under the terms of the Creative Commons Attribution-NonCommercial 4.0 License (http://www.creativecommons.org/licenses/by-nc/4.0/) which permits non-commercial use, reproduction and distribution of the work without further permission provided the original work is attributed as specified on the SAGE and Open Access pages (https://us.sagepub.com/en-us/nam/open-access-at-sage).

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Figure 1. — Tryptophan disposition between the liver and the brain. 5-HT indicates 5-hydroxytryptamine; 5-HTP, 5-hydroxytryptophan; ALAAD, aromatic l-amino acid decarboxylase; CAA, competing amino acids; IDO, indoleamine 2,3-dioxygenase; IPA, indolepyruvic acid; NAD⁺, oxidized nicotinamide adenine dinucleotide; TDO, Trp 2,3-dioxygenase; TPH, Trp hydroxylase; Trp, tryptophan.