CELF1 and myotonic dystrophy type 1: hnRNP A2/B1 is also known to mediate the indirect interaction between CGG repeats and CUGBP1, a RBP noted for its binding of CUG repeats and involvement in myotonic dystrophy type 1 (DM1; Timchenko et al., 1996, 2001, 2004).