PAX7 and myotonic dystrophy type 1: The proportion of proliferating SSCs (Pax7+MyoD+) in the DM1-03 group was lower than that in the DM1-04 group, while that in the DM1-13-3 group was higher than that in the DM1-03 group, but was lower than that in the DM1-04 group (Fig. 1b, c).