Figure 3.

Whole-cell potassium currents. A, Representative recording demonstrating the whole-cell potassium current recorded in the presence of TTX. From a holding potential of −70 mV, voltage was stepped to –100 mV, followed by depolarizing steps in 10-mV increments to a final voltage of +10 mV (schematic of voltage step protocol shown in inset). Arrows indicate where measurements were made for the transient (left) and sustained (right) components of the current. B. An expanded view of the portion of the trace outlined by the dotted box in A, showing the capacitive artifact, followed by the rapidly activating and inactivating, transient current component.