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Percent choice in four monkeys for 1:1 and 2:2 mixtures of cocaine/remifentanil when cocaine was offered as an alternative at 100 μg/kg/inj (Coc 100; black bars) or 560 μg/kg/inj (Coc 560; gray bars) and remifentanil at 1.7 μg/kg/inj (Remi 1.7; diagonally hatched bars)
