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. 2018 Mar 14;18:14. doi: 10.1186/s12896-018-0426-1

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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 — Quantitative RT-PCR analysis of collagen type II, aggrecan and collagen type I expressions in human chondrocytes cultured on G5 (open bar) and PS (closed bar) surfaces. Data represent average values with the standard deviation determined from three independent experiments and considered significant at *p < 0.05 and **p < 0.01