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Generation of Exo-124. A: Diagram showing the procedure used to generate Exo-124. We repeatedly harvested Exo-124 from HEK 293 cells overexpressing miR-124. B: The harvested Exo-124 pellets. C: Expression of CD9 and CD63 in Exo-124. Exosomes harvested from the conditioned medium expressed CD9 and CD63, whereas exosomes from the normal control medium did not express these markers. D: Compared to the control exosomes (Exo-ctr), Exo-124 expressed a high level of miR-124, as measured by real-time PCR (n = 3 per group). *p < 0.05.