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. 2017 Mar 21;13:74. doi: 10.1186/s12917-017-0990-y

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© The Author(s). 2017

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 — Synovial fluid PGE₂ (a) and SP (b) concentrations in osteoarthritic and control joints. The central horizontal line indicates the median value and the boxes indicate the IQR. The top and bottom whiskers represent the highest and lowest case within 1.5 times of IQR, respectively. Values more than 1.5 times IQR are labelled outliers and represented as dots. *Values differ significantly (P = 0.001)