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. 2021 Apr 22;12(2):117–128. doi: 10.1007/s13167-021-00239-0

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© The Author(s) 2021

Open AccessThis 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 licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence 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 licence, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 1 — Metabolic profile of serum based on LC–MS. a Heatmap of metabolites between the ESRD group and the HC group. b PCA score plot model of serum samples. c OPLS-DA score plot of serum samples. d OPLS-DA permutation plot of serum samples. LC–MS, liquid chromatography/mass spectrometry; ESRD, end-stage renal disease; HC, healthy controls; OPLS-DA, orthogonal partial least-squares discriminant analysis; PCA, principal component analysis