Fig. 6.

Lack of discernible current during the recovery phase of inactivated T-channels. The cell was held at −120 mV and stepped to −40 mV for 500 msec (the inactivating pulse) and then stepped back to −80 mV (top) or −120 mV (bottom) to recover the inactivated T-channels. La³⁺-subtracted currents are used to eliminate contamination from leak or other nonspecific currents. No matter that the recovery potential is −80 or −120 mV, there is no discernible ionic current associated with recovery of the inactivated T-channels.