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Comparison of epicardial APD90, VERP, and local critical intervals for re-excitation measured during steady 8-Hz extrinsic pacing over a range of nicorandil concentrations in the epicardium of KCNE1−/− (a) and WT (b) hearts (*P < 0.05; **P < 0.01; ***P < 0.001). APD90 data set from Fig. 5
