MBNL1 and myotonic dystrophy type 1: In the developing brain, we observed that all 8 splice events with increased inclusion in the prenatal state and in DM1 patients were strongly positively correlated with the expression of CELF1 and strongly negatively correlated with the expression of MBNL1 and MBNL2 (Figure 4 and Supplementary Figure S9, examples in Supplementary Figure S10A).