Fig. 9. The effect of bafilomycin, an inhibitor of V-ATPase, on the rate of acidification of the external medium induced by acid secretion of isolated pseudobranch cells (A) and gill cells (B) as a function of time. Bafilomycin (1 µmoll^-1) was added for the period indicated. Values are means ± S.E.M., N=8 (A); N=9 (B). Asterisks indicate significant differences from the values before application of bafilomycin.