Fig. 2.

La³⁺ blockade of T-current.A, The cell was held at −120 mV and stepped every 5 sec to −50 mV for 300 msec to elicit T-current. The same pulse protocol was repeated in the presence or absence of 10 μm external La³⁺. It is evident that 10 μmLa³⁺ inhibits most of the T-current.B, The La³⁺-sensitive current is obtained by subtracting the current in the presence of external La³⁺ from the current in the control external solution.