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Oxycodone self-administration and seeking. A) Active lever responses for oxycodone. B) Active lever responses in rats that received yoked saline infusions. C, D) Oxycodone infusions earned during FR-2 (C) and FR-4 (D) sessions. E) Active presses during extinction trial. Boxes represent median and quartiles, whiskers represent range. Bars represent mean +- SEM. *pÔëñ0.05.
