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. 2018 Aug 9;20:173. doi: 10.1186/s13075-018-1666-0

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© The Author(s). 2018

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided 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 Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Fig. 3 — Cytokine expression and cluster analysis of patients with systemic lupus erythematosus. a Correlation between the 10 cytokines: the 2 cytokines associated with active disease are shown in gold. The lines represent correlation with a p value <0.05. The thickness and colour of the lines show the strength of the Spearman correlation: red, r > 0.4; blue, r 0.21–0.4; grey, r < 0.2. b Scatterplot of the first two principal components (PC1 and PC2) showing three main groups. CXCL, chemokine (C-X-C motif) ligand; BLyS B, lymphocyte stimulator; IFNα, interferon alpha; PTX, pentraxin-related protein; MCP, monocyte chemotactic protein