Fig. 9. Current activation kinetics of Ca_V3 channels is slowed down by NA.

Current recordings as shown in Fig. 8A were fitted by the sum of two exponentials, one for activation and the other for current decay. The resulting time constants (taus) were plotted as function of the test potential for each channel as indicated. The larger modifications were observed in the current activation of Ca_V3.2 and Ca_V3.3 channels. Insets: Tau of inactivation versus test potential for the same channels.