*2.3. Gln347, Gln<sup>725</sup> and Gln<sup>990</sup> Also Modulate the Transport of the Phenylalkylamine BODIPY-Verapamil*

To test whether Gln347, Gln725, and Gln<sup>990</sup> are also important for the transport of a different drug class, the transport assays were repeated with a fluorescent derivative of the phenylalkylamine verapamil, which acts as a calcium channel blocker and is used clinically to treat a variety of heart arrhythmias.
