Figure 7.

Comparison of closing and opening rate constant fits for the ATB model. The fixed values of α and β (used for the Mg-free channel) are indicated by the filled triangle. Other symbols show least-squares fits of voltage step responses. Each symbol represents fits to different families of responses from the same nucleated patch, with the SD of fits to individual traces indicated, except for the filled circle where data for voltage steps from -70 to +40 mV were pooled from different experiments (n = 4). Averages and SDs are from best simultaneous fits of α′ and β′ for 6-10 leak-corrected averaged current responses.