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Changes in asymptotic rate of responding in F1 animals, expressed as percentage of predrug value, following acute i.p. administration of 0 mg/kg (A), 0.1 mg/kg (B), 0.5 mg/kg (C), and 1 mg/kg (D) of Δ9-THC, during first and second postinjection session. Horizontal axes represent the three groups of F1 animals.
