Figure 2.

Ca²⁺ block in 2 and 40 mM Ca²⁺ at physiological voltages. The pulse protocol was the same as in Fig. 1. Current is shown during the activating and repolarizing pulses in A, but only during the repolarizing pulses in B–D. The slow component of the tails was fit with a single exponential in B–D. Solutions: 2 Ca 10 K or 40 Ca 10 K//155 K.