NPPB and cardiomyopathy: Decreased levels of myocardial enzyme markers in the serum (Ck, Ck‐mb, Ldh, Ldh‐1, and Ast), and reduced mRNA expression of fetal cardiac genes (Anp and Bnp) were observed in mice with Dox‐induced cardiomyopathy (Figure 6C,D), indicating a restoration of cardiac function.