
Tolerance to the reinforcing effects of morphine in delta9-tetrahydrocannabinol treated mice
Keywords: CPP, conditioned place preference; GPCR, G-protein-coupled receptor morphine; mor, morphine; sal, saline; THC, delta9-tetrahydrocannabinol; veh, vehicleConditioned place preference; Y-maze; Locomotor activity; Morphine; Reward