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. 2021 Jun 16;17(7):59. doi: 10.1007/s11306-021-01805-3

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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. 3 — PCA (PC1: 45.2%, PC2: 19.3%, PC3: 9.6%) plot of patients with psoriasis who developed psoriatic arthritis prior to disease progression (baseline converters) and patients with psoriasis who had not developed psoriatic arthritis (baseline non-converters). Baseline converters and baseline non-converters are represented by red and green, respectively. Data were obtained via negative mode acquisition and were similar to the results obtained in positive mode acquisition (data not shown)