Effect of varying doses of Dyn A-(2-17) i.v. on the sensitivity to morphine coadministered spinally and supraspinally at the fixed ratio of 1:10 in mice rendered tolerant to morphine by pellet implantation
Doses of Dyn A-(2-17) (μmol/kg)
Apparent AD50 +S.E. Values of Morphine (nmol/mouse)2-a