HNRNPH1 and myotonic dystrophy type 1: To test if other hnRNPs have similar effects on DM1 targets, protein expression levels for two additional hnRNPs, HNRNPH1 and HNRNPA2B1, were examined in DM1 biopsies, but the expression levels of these hnRNPs were not significantly different from controls (SI Appendix, Fig. S4 A and B).