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. 2019 Dec 18;13:1365. doi: 10.3389/fnins.2019.01365

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Copyright © 2019 Kaur, Bose and Mande.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Distribution of tryptophan transporters in gut bacteria. (A) Pie-chart depicting the proportion of indole producing gut bacteria predicted to have tryptophan transporters versus those not utilizing the same. (B) Venn diagram representing the distribution profile of three known transporters namely, TnaB, Mtr, and AroP in gut bacteria. (C) Heat-map showing the proportion of strains in each of the five gut bacterial genera predicted to utilize the three tryptophan transporters (TnaB, Mtr, and AroP).