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. 2017 Dec 19;8:284. doi: 10.1186/s13287-017-0728-6

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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 — Biochemical assays to quantify DNA (a), sGAG (b), and collagen deposition (c) of ECM-containing hydrogels following 21 days of in vitro culture under chondrogenic conditions. Statistical significance of soft and stiff hydrogels are compared against soft and stiff controls, respectively; *p < 0.05. dw dry weight, CS chondroitin sulfate, HS heparin sulfate, sGAG sulfated glycosaminoglycan