Myogenic commitment of desmin-positive mdx SCs cultured for 24 h in growth medium and for 7 days in differentiation medium (DM), DM supplemented with 10 8 Exo C2C12 or DM supplemented with 10 8 Exo Myo . Scale bars, 75 m. Graphs show quantification of the fusion index and myotube area, length and width. Data are presented as mean ± s.d.; n = 2 or 3 independent experiments, for each experiment n = 3 or 4 images per group were quantified; ordinary one-way ANOVA followed by post hoc Tukey multiple-comparison test.