JDP2 and atrial fibrillation: Indeed, spontaneous paroxysmal AF was detected in 9 of 11 JDP2 mice 4 and 5 weeks after the start of JDP2 overexpression (Figure 1B), whereas no episodes of AF were detected in WT mice (n = 10; p = 0.0002 vs. JDP2 mice, Fisher’s exact test).