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Effect of guanethidine on 30 μM nicotine-induced relaxations of longitudinal muscle strips of rat gastric fundus. The experiments were performed during a 0.1 μM 5-HT-induced contraction in the presence of 1 μM atropine. Results are shown as the means±s.e.mean and expressed as percentage of decrease of the 5-HT-induced contraction for n=6–12. *P value <0.05, significant different from time corrected controls.
