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Frequency of breathing Panel (A), tidal volume Panel (B) and minute ventilation Panel (C) prior to (Pre), following the injection of morphine (10 mg/kg, IV), and then two injections of vehicle or L-cysteine methyl ester (L-CYSme, 500 μmol/kg, IV) given 15 min apart, in freely-moving rats. The data are presented as mean ± SEM. There were 6 rats in each group.
