The transwell assay showed that, after being cultured with exosomes, the migration ability of DFLs was enhanced (Fig. 5A). As a result, the migration of DFLs in Ti-P2-EX was slightly higher than Ti, Ti-EX and Ti-P1-EX group. Consistent with the report suggesting otherwise, we found that exosomes had effect on cell migration, in agreement with other studies demonstrating a positive impact of exosome on cell migration.