Modeling Ca_v2.3 channel gating under control conditions. Comparison of I-V relationships (A), activation and PPI curves (B), II-V relationships (C), and activation and deactivation time constants (D), determined in the same way from either experimental control recordings with 4 mM Ca²⁺ as the charge carrier (open squares) or from currents simulated with the model shown in Fig. 15 (turquoise crosses).