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. 2021 May 28;9:644380. doi: 10.3389/fcell.2021.644380

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Copyright © 2021 Wang, Li, Cui, Cui, Chen and Wang.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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(A) The morphology of human bone marrow mesenchymal stem cells (BMSCs). (B) Transmission electron microscopy image of exosomes isolated from human BMSCs. (C) The size distribution of exosomes determined by nanoparticle tracking analysis. (D) The images of exosome-specific CD9, CD63, and HSP70 proteins examined by western blot.