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Mean absolute potential difference values±s.e.mean recorded in both the distal (a) and proximal (b) regions of the guinea-pig, Wistar or Sprague–Dawley (SD) rat trachea, immediately following a 60 min exposure to an aerosol of vehicle (water for injections) or benzamil (100 μM). Benzamil significantly attenuated the potential difference in the distal trachea of guinea-pigs only; n=6–13 animals per group. * Indicates P<0.001, using Student's two-tailed t-test.
