We further examined the expression of molecular marker genes and found that the expression of brain natriuretic peptide (Nppa) and beta-myosin heavy chain (β-MHC, encodes by Myh7), molecular markers of cardiomyopathy, was reduced 2 months after miR-19a/19b injection (Fig. 2k). This evidence concerns the gene NPPA and cardiomyopathy.