DUX4 and facioscapulohumeral muscular dystrophy: This in line with the findings of van den Heuvel et al. (2019) (32) obtained using a 67 DUX4 target gene subset (DUX4-67 gene set) of the full Yao et al. (2014) (30) DUX4 target gene signature, where 0.4% (23/5133) of the FSHD cells had ≥5 DUX4 target genes, but none of the controls.