MBNL1 and myotonic dystrophy type 1: In serum exRNA, ddPCR also confirmed a similar splicing pattern of MBNL2 exon 6 and MBNL1 exon 7 in the DM1 and UA groups, and suggested a small increased exon inclusion for both transcripts in DM2 subjects as compared to UA controls, although inclusion percentages for all three groups were substantially lower than in urine exRNA (Supplementary Fig. 8).