DUX4 and Facioscapulohumeral dystrophy: DUX4 transcripts are also detectable in immune cells in secondary lymphoid organs (inguinal lymph nodes and spleen) in the D4Z4‐2.5/Dnmt3bMommeD14 and D4Z4‐2.5/Smchd1MommeD1 mouse models of FSHD (Bouwman et al, 2020).