Furthermore, overexpression of wild‐type Fto, not mutant, increased AF inducibility (Figure 4A–C) and prolonged active time, enhanced dispersion, shortened duration of APD90, increased APD30/80 (Figure 4D–H), unchanged duration of APD30, and shortened duration of APD80 (Figure S6E,F). The gene discussed is FTO; the disease is atrial fibrillation.