Comparison of currents induced by dipeptides and drugs. (A) Gly-Sar-, Ala-Ala-, penicillin (Pen)- and enalapril (Enal)-induced currents. Concentration of all substrates was 3 mM and Gly-Sar-induced current was normalized as 100%. Data represent mean ± SEM, *p < 0.05 compared with Gly-Sar (n = 5 to 7). (B) Gly-Sar-, Ala-Ala-, penicillin- and enalapril-induced currents in the absence and presence of 200 mM ethanol. Currents obtained in the absence of ethanol were normalized as 100%. Data represent mean ± SEM, *p < 0.05, +p = 0.08 compared with Gly-Sar-induced current (n = 3 to 7).