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Morphine-induced conditioned place preference in adult (upper panel) and adolescent (lower panel) male C57BL/6J mice after pre-exposure to morphine (four daily injections, ending three days before conditioning started) (experiment 2). Results are shown as mean (± SEM) values (n=8–12). Error bars that are not shown are contained within the symbol. Asterisks indicate p<0.05 compared with results in mice pre-exposed to saline.
