The AF inducibility experiment revealed a significantly greater propensity for AF and longer AF duration in Myh6‐cre−; Ftofl/fl mice compared with Myh6‐cre+; Ftofl/fl mice at 19 months of age (n = 10/group) (Figure 3A–C), however, there was no such difference between the two groups of mice studied at 2 months of age. The gene discussed is MYH6; the disease is atrial fibrillation.