Table 1. Changes in the Time Constant Ratio by Halogenated Compounds

Values are mean ± SE of the time constant ratio. Number of experiments was 4 to 9 for each condition. The time constant ratio was calculated by dividing the time constant in the presence of the halogenated agents with the average of the values obtained before and after the agents. Control represents the ratio obtained in control experiments in which we successively applied nicotine alone three times and calculated the ratio of the time constant of the second response relative to the average of the first and third responses. The time constant was derived from fitting the decaying phase of the current with a single exponential function.

* Significant difference from control with P  less than 0.01.