Fig. 9. Effects of PDBu and forskolin on the Na⁺ currents. (A) Representative example of time course of the current signal after superfusion with 10 µmol l^–1 PDBu. (B) Representative example of time course of the current signal after superfusion with 10 µmol l^–1 forskolin. (C) Na⁺ current magnitude before (white bars) and after superfusion with each drug (hatched bars). The currents were elicited by 20 ms pulse from a holding potential of –84 mV to a test potential of –24 mV. Values are means ± S.E.M. Numerals within parentheses are number of the cells sampled.