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. 2021 Jun 30;19:194. doi: 10.1186/s12951-021-00940-2

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© The Author(s) 2021

Open AccessThis article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/. 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 in a credit line to the data.

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Fig. 8 — sh-MYH9 decreased COL2A1, Aggrecan and Sox9, increased MMP-13 and Runx2. A After the treatment of OA mouse derived chondrocytes with sh-MYH9, MSCs-EVs and MSCs-circHIPK3-EVs, the expression changes in these key cartilage genes (COL2A1, Sox9, Runx2, Aggrecan and MMP-13) by qRT-PCR. B After OA mouse derived chondrocytes were treated with sh-MYH9, MSCs-EVs and MSCs-circHIPK3-EVs, Western blot was performed to detect the expression change in these key cartilage genes (Sox9, COL2A1, Aggrecan, Runx2 and MMP-13). *P < 0.05, **P < 0.01