(D), Left panel: residual currents determined at the end of 10-minute measurements as shown in (C). (D), Right panel: time constants (τ) of the current rundown obtained by fitting monoexponential functions to individual measurements as depicted in (C), (n= 5-11). Asterisks indicate statistical significances evaluated using two-sample t-test analysis (*, p < 0.05; ***, p < 0.001, n.s., not significant). 