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. 2018 Mar 9;22:6. doi: 10.1186/s40824-018-0116-z

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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. 4 — GAG deposition (a) and histological observation of alcian blue staining (b) on day 14. $ indicates a significant difference as compared with GM group. * indicates a significant difference as compared with FBS group within the same growth factor. # indicates a significant difference as compared with FBS group with growth factors. (*^$#p < 0.05)