Fig. 4.

Transepithelial electrophysiological properties in non-CF and CF epithelia following withdrawal of chronic cAMP stimulation. Left panels indicate Gt (A), Isc (B), and Vt (C) under basal conditions and after additions indicated in legend of Fig. 1. Right panels show changes with amiloride addition. In some cases error bars are hidden by symbols. n = epithelia from 261 non-CF donors and 105 CF donors; data for each donor were the average of measurements from 1–12 epithelia (three epithelia were measured for most donors). *P < 0.05, unpaired t test.