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. 2021 Oct 26;19:343. doi: 10.1186/s12951-021-01086-x

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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. 4 — The effects of EVs-COS on the expression levels of related genes and proteins in the chondrocytes with different treatments. The mRNA expression of IL-1β (A), COL1A1 (B), COL2A1 (C), OPN (D), ALP (E), OCN (F), RUNX2 (G), Akt1 (H), PI3K (I), c-Myc (J), p53 (K), and Bcl2 (L). M The protein bands determined by Western blot. (N) The protein expressions of COL1A1, COL2A1, ALP, OCN, OPN, RUNX2, p-Akt/Akt, PI3K, c-Myc, and p53. *P < 0.05, compared with the control group; ^#P < 0.05, compared with the IL-1β group; ^$P < 0.05, compared with the IL-1β+COS group; ^&P < 0.05, compared with the IL-1β+EVs group