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. 2017 Nov 15;8:264. doi: 10.1186/s13287-017-0719-7

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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. 6 — Expression profile of COL1A1, COL2A1, COL10A1, ACAN, and SOX9 after 3 weeks of chondrogenic induction in monolayer (a) and pellet (b) culture. Gene expression of each group was normalized to the AC group. Data are presented as mean ± SD. *P < 0.05. AC articular chondrocyte, MSC mesenchymal stem cell, NP nanoparticle