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Figure 1 (A) Induction of sustained atrial tachycardia in wild-type mouse after carbachol administration. Three atrial extrastimuli are delivered following a basic drive train of 150 ms. (B)Sustained atrial fibrillation, with irregular atrial cycle lengths and variable ventricular response. IECG = intracardiac electrogram; mV = millivolts; RA = right atrial; RV = right ventricular.