Effect of NaHS pretreatment on AC isoforms mRNA expression in the striatum of morphine-treated mice. (A) Representative gel images. (B) Quantifications by densitometric measurement. Mean±S.E.M, n=4. **p<0.01, versus Con; #p<0.05, ###p<0.001, versus Mor. Con, control; Mor, morphine; S, NaHS.