DUX4L9 and facioscapulohumeral muscular dystrophy: Furthermore, we found DUX4c staining in all the dMyHC-positive fibers (that represented ~ 1.2% of the ~ 3000 analyzed myofibers in agreement with the percentage found by [32] in other FSHD muscles) either in nuclei (Fig. 4A, B) or next to them (Fig. 4B).