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(A) Typical examples of action potentials (AP) and delayed afterdepolarizations (DADs, arrow). (B) Average number of DADs, (C) Average AP characteristics. RMP, resting membrane potential; APA, AP amplitude; dV/dtmax, maximal AP upstroke velocity; APD20, APD50, and, APD90, AP duration at 20, 50, and 90% repolarization, respectively, *P < 0.05.
