DUX4 and facioscapulohumeral muscular dystrophy: Tissue expression patterns of these eight genes are not well characterized outside of the FSHD context, however, their expression has been reported during zygotic genome activation (Taubenschmid-Stowers et al., 2022) and in testicular tissue (Taubenschmid-Stowers et al., 2022; Ishiguro et al., 2017), both settings where DUX4 is physiologically expressed.