1. WT WT KO KO A Acta1 Acta1 Actc1 Actc1 MyoD MyoD Pax3 Pax3 B GAPDH GAPDH * * *** *** *** *** *** *** Gene/GAPDH Gene/GAPDH WT KO WT KO WT KO WT KO WT KO WT KO WT KO WT KO Acta 1 Acta 1 Actc 1 Actc 1 MyoD MyoD Pax 3 Pax 3