Figure 5. The current-voltage relationship of the nicotine-induced current in the absence and presence of thiopental. Instantaneous current-voltage curves were obtained for nicotine, 30 micro Meter, alone (Nicotine) and for nicotine with thiopental, 30 micro Meter, after preincubation of thiopental (Nicotine + Thiopental) as described in method. The similar current-voltage curves were obtained with four other cells.