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Individual subjects data for the small dose of fentanyl alone and in combination with naltrexone, CBD, THC and THC:CBD mixtures. Triangles represent subject MO, inverted triangles subject IP, circles subject WI, squares subject AS and horizontal lines the group mean. Small dose fentanyl was 0.0001 mg/kg/infusion for all subjects. N=4. NTX: naltrexone, CBD: cannabidiol, THC: Δ9-tetrahydrocannabinol.
