MBNL1 and myotonic dystrophy type 2: MBNL proteins bind to YGCY motifs using Zn finger RNAbinding motifs [10,11], including sequences foundin the toxic RNAs (expanded CUG and CCUG repeats) that cause both myotonic dystrophytype 1 (DM1) and myotonic dystrophy type 2 (DM2) [12–16].