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. 2019 Feb 26;24:16. doi: 10.1186/s11658-019-0144-2

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© The Author(s) 2019

Open Access This 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 — Staining results for the process of differentiation induction in the 2D environment. (a) Toluidine blue staining; (b) Collagen II immunohistochemical staining; (c) Annexin V-Cy3 immunofluorescence staining. (Bar = 100 um)