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. 2019 Oct 1;10:1254. doi: 10.3389/fphys.2019.01254

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Copyright © 2019 Fiedorowicz, Choragiewicz, Thaler, Schuettauf, Nowakowska, Wojtunik, Reibaldi, Avitabile, Kocki, Turski, Kaminska, Grieb, Zrenner, Rejdak and Toro.

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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Concentrations of tryptophan (TRP), kynurenine (KYN), kynurenic acid (KYNA), and 3-hydroxykynurenine (3-HK) in retinas of animals after intravitreous injection of NMDA (right side of the graph) or PBS (left side). Kynurenine metabolite concentrations were measured 2 and 7 days after NMDA or PBS injection. N = 9, Mean ± SD. ^∗∗p < 0.01, ^∗∗∗p < 0.001.