Figure 4. Effect of BAB on the fast sodium currents, measured in response to four test potentials (as indicated), applied in the absence of a conditioning prepulse. (Inset) Voltage protocol. (Left) Control currents. (Middle) Currents in the presence of BAB at about 2 min after application. The ratio of I^p,max in BAB and control is 0.16. With preceding hyperpolarization, this ratio amounted to 0.91. (Right) Washing-out BAB for 10 min.