Fig. 1. Effects of the Nigella arvensis (NA) extract on short-circuit current (I_sc), transepithelial conductance (G_T) and transepithelial capacitance (C_T) in cultured monolayers of A6 epithelia under Na⁺-transporting conditions. The A6 cells were incubated in 102 mmoll^-1 NaCl-Ringer solutions on both surfaces. 250 µll^-1 NA extract was applied either to the apical side (dashed line) or basolateral side (solid line) of the monolayer. At the end of the experiment, Na⁺ current was inhibited by apical 50 µmoll^-1 amiloride (Ami). The traces are mean values from six tissues; dotted lines represent means ± S.E.M.