As expected, HF in TAC mice was associated with an isoform switch from α‐MHC (α myosin heavy chain, MYH6) to foetal β‐MHC (β‐myosin heavy chain, MYH7) (Figure 2A,B) as well as increased expression of atrial natriuretic peptide (ANP, NPPA) and brain natriuretic peptide (BNP, NPPB) (Figure 2C,D). The gene discussed is NPPA; the disease is hydrops fetalis.