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. 2018 Aug 15;16:229. doi: 10.1186/s12967-018-1598-0

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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. 2 — Immunohistochemical integrated optical density analysis of YKL-40 expression in the adipose tissue of patients with atrial fibrillation (AF, n = 28) and sinus rhythm (SR, n = 36). a Representative sections of three types of adipose tissue in the AF and SR groups. The EAT of AF group was obviously more evident in staining. b Quantitative results of IOD in sections of three types of adipose tissue in the AF and SR groups. *P = 0.007, **P < 0.001. SAT subcutaneous adipose tissue, PAT paracardial adipose tissue, EAT epicardial adipose tissue