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. 2022 Jul 16;13:322. doi: 10.1186/s13287-022-03005-9

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© The Author(s) 2022

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. 1 — Identification of human umbilical cord MSCs and EVs. A. A typical spindle-like morphology of hucMSCs. B. Flow cytometry analysis showed that hucMSCs expressed specific markers on their surface. C. Transmission electron microscope image of hucMSCs-EVs. D. Particle size distribution of hucMSCs-EVs analyzed by NanoSight. E. EVs special markers (CD9, CD63, Alix, TSG101) analyzed by western blot. F. Macrophages endocytose EVs observed by fluorescence microscope