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. 2021 Nov 20;11:595. doi: 10.1038/s41398-021-01688-x

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© The Author(s) 2021

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 3 — A There was a significant correlation between serum IDO levels and the PANSS negative symptom scores in all schizophrenia patients. B The reduction in the PANSS negative score showed a significant positive correlation with the decrease in serum levels of IDO in the celecoxib group. P < 0.05.