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Characterization of mesenchymal stem cells (MSCs) and mesenchymal stem cell‐derived exosomes (MSC‐Exos). A, The morphology of MSCs, Scale bar = 200 µm. B, Transmission electron micrograph image of MSC‐ Exos, Scale bar = 500 nm. C, Particle size distribution of MSC‐Exos measured by Nanoparticle Tracking Analysis. D, Western blot results indicating positive expression for the TSG101, CD9 in the MSC‐ Exos
