Figure 3. Kinetic analysis of junctional currents.
A, plot of time constants of Ij inactivation (τi) versus Vj. Each symbol corresponds to a mean value ± 1 s.e.m. Data from 8 cell pairs. The continuous curves represent the best fit of data to single exponentials; τi,0= 8.5 and 11.4 s and Vτ= -27.4 and 24.4 mV for negative and positive Vj values, respectively. B, plot of rate constants of channel opening, α (•), and channel closing, β (○), versus Vj. The continuous curves correspond to the best fit of data to single exponentials; λ= 0.21 and 0.18, Aα= -0.069 and 0.102, Aβ= -0.042 and 0.049, and Vj,0= -24.1 and 27.8 mV for negative and positive Vj values, respectively.