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Representative tracings of A: TKO mice and B: WT mice. Atrial burst stimulation close to the refractory period (S1S1: 30 ms) failed to induce atrial fibrillation (AF) in TKO. The same burst led to the induction of an AF episode in WT that terminated spontaneously after 8.7 seconds. Surf: Surface ECG. His: Intracardiac ECG close to His bundle.
