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APs elicited by INaL enhancement (12×) in the GPB human ventricular myocyte model during constant pacing at 0.25 Hz (BCL = 4000 ms) at varying IK1 maximal conductance (GK1). Traces in A) are obtained with IK1 carried by Kir2.x mix), while traces in B) are obtained with IK1 carried by Kir2.1 only. C) IK1-Em relationships for Kir2.x and Kir2.1 models.
