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. 2019 Jan 24;10:45. doi: 10.1186/s13287-019-1133-0

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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. 4 — nsPEF-preconditioned MSCs enhanced cartilage regeneration in vivo. a Macroscopic view of cartilage repair. b ICRS Macroscopic score of joint. n = 6 per group. c Safranin o-fast green staining, Alcian blue staining, immunohistochemical staining of sections for collagen type II, collagen type I and collagen type X. d ICRS visual histological score of tissue sections. n = 6 per group