Electrophysiological data of Na<sub>V</sub>1.5 in HEK293T cells coexpressing PMCA4b, nNOS, and either WT or SNTA1 mutants.

<p>(A) Representative traces of inward Na<sup>+</sup> current for the 3 groups tested. (B) I-V curve. (C) Activation (G/Gmax). (D) Inactivation (I/Imax). (E) Recovery (P2/P1).</p>