Exon inclusion showed significant correlation with CTG repeat length in DM1 males for MAP3K4 (r = 0.62, P = 0.005), but no correlation in DM1 females (Fig. 7b), while splicing of INSR, MBNL2, MBNL1, and CLASP1 showed weak or no correlation with CTG repeat length in either group (Supplementary Fig. 7). This evidence concerns the gene MBNL2 and myotonic dystrophy type 1.