Reversible, cAMP-dependent increases in whole cell conductance of oocytes expressing hCFTR. a Representative I–V relations of an oocyte before (open circles), during (shaded boxes), and after (black boxes) activation with a cAMP cocktail. b Average whole cell conductance of hCFTR expressing oocytes (n = 10) before (open box), during (gray box), and after (black box) superfusing with cAMP cocktail. Average conductance of water-injected oocytes was low (1.68 ± 0.41, n = 8) and not significantly different before, during, or after cAMP superfusion. An asterisk represents a significant difference (P < 0.05)