Simulated Zn²⁺ effects on the shape of macroscopic Ca²⁺ currents. (A) Simulated I-V current traces evoked in response to 25 ms (left) or 400 ms (right) voltage steps to the indicated test potentials, with the free Zn²⁺ concentration set to 0 (black) or 5.4 µM (orange). They have been scaled to their maximum amplitude to highlight kinetic changes. Scale bars correspond to 10 and 100 ms for short and long voltage steps, respectively. (B) Simulated II-V current traces evoked at the indicated test potentials, with the free Zn²⁺ concentration set to 0 (black) or 5.4 µM (orange). They have been scaled to their maximum amplitude to highlight kinetic changes. Scale bars correspond to 2 ms for the tail current at −60 mV and 10 ms for all other test potentials.