PABPN1 and oculopharyngeal muscular dystrophy: Muscle from individuals with OPMD is characterized by the presence of intranuclear aggregates containing PABPN1, RNA, other RNA binding proteins, and heat shock proteins (Tome and Fardeau, 1980; Calado et al., 2000; Fan et al., 2003; Tavanez et al., 2009; Klein et al., 2016).