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. 2021 May 10;12:280. doi: 10.1186/s13287-021-02336-3

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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/. 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 in a credit line to the data.

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Fig. 2 — Characterization of the macrophage activation model. a THP1 cell treatment protocol for in vitro polarization of macrophages. b Morphology (phase contrast, scale bar 100μm) of THP1-derived macrophages on day of CM harvest. c Heatmap of log2 cytokine protein levels in differentially activated macrophages. The dendrogram represents the result from a complete linkage hierarchical clustering of mean-centered expression levels based on Euclidian similarity. d mRNA-expression levels of macrophage-selective markers (M^(IFNG/LPS): CD80, IL1B, and M^(IL4/IL13): CD200R, TGM2). Data were normalized to the 18S rRNA reference gene and shown as mean –ΔCt. Asterisks indicate p values < 0.05 (*), p<0.01 (**), and p<0.001 (***). Statistical significance (n=5) was determined by using one-way ANOVA and Dunnett’s test for multiple comparison