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. 2019 Jun 25;17:211. doi: 10.1186/s12967-019-1960-x

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© The Author(s) 2019

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 — The results of histological evaluation for tendon repair at 4 weeks after surgery. a The HE staining of window defect on the patellar tendon at 4 weeks after surgery. b Masson’s trichrome staining of window defect on the patellar tendon at 4 weeks after surgery. c Fiber alignment score was significantly higher for the rats in the BMSC-EVs and fibrin groups compared with control group (n = 8 donors). Bars: 100 μm, ×20. Data are represented as mean ± SD. **p < 0.01