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Number of inactive lever presses emitted per 2 hr session during the last 5 days of methamphetamine self-administration (SA), 16 days of extinction training (E1–E16) and contextual reinstatement (Reinst). Data (mean ± SEM) from animals treated with vehicle during extinction (n=14) are shown in filled symbols, and from animals treated with CDPPB during extinction (n=16) are shown in open symbols.
