Model of ICa,L in PF (A) and ventricular (B) cells. Simulation results (lines) and experimental data (symbols) from PF (24) and ventricular (25) cells: (i) steady-state activation and inactivation curves, (ii) activation and inactivation time constants, (iii) current traces generated during 200 ms voltage-clamp pulses from the holding potential of −40 mV to 60 mV in steps of 10 mV, and (iv) I/V relationships. (C) Characteristics of the PF and ventricular cell models: (i) half activation and inactivation voltages, and (ii) simulated peak current densities as compared with experimental data (24–26,32).