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(A) Images of migrated cells for each condition. Myoblasts migration in response to the young and old secretome after 18 h. A quantitative analysis of the invaded area was four fold higher in the presence of young secretome old, ***P < 0.0001. All CMs (CM2–4) were not significantly different, P > 0.05 (B). The results were obtained from at least four independent experiments.
