CELF1 and myotonic dystrophy type 1: Both MBNL1 and CUGBP1 have been identified in SGs of mammalian cells (Fujimura et al., 2008; Onishi et al., 2008), and increased numbers of SGs have been reported in DM1 myoblasts as compared to SG numbers in control myoblasts grown under normal conditions (Huichalaf et al., 2010).