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Line graphs displaying operant and infusion data from rats submitted to repeated blood sampling and behavioral testing. A, Rats received infusions of cocaine (200 μg cocaine/infusion) or saline across the last 12 d of self-administration. Graphs in middle (B) and right (C) depict active and inactive lever presses, respectively. n = 7 yoked-saline; n = 10 yoke cocaine; n = 11 SA cocaine.
