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. 2023 Sep 20;24(18):14334. doi: 10.3390/ijms241814334

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© 2023 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).

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Chromatographs of a standard solution of 5-HT, 5-HIAA and QA. Abbreviations: 5-HT—5-hydroxytryptamine or serotonin, 5-HIAA—5-hydroxyindole acetic acid, QA—quinolinic acid, IS—internal standard and AU—arbitrary units.

Chromatographs of a standard solution of 5-HT, 5-HIAA and QA. Abbreviations: 5-HT—5-hydroxytryptamine or serotonin, 5-HIAA—5-hydroxyindole acetic acid, QA—quinolinic acid, IS—internal standard and AU—arbitrary units.