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Effect of RS67333 on the place recognition memory (n = 38): The intra-NBM injection of two increasing doses (40 ng/0.5μL, n = 10; 200 ng/0.5 μL, n = 9) of the drug within 30 sec from the end of the first trial (postacquisition treatment) improves memory. A higher dose (500 ng/0.5 μL, n = 12) has no effect. The points indicate the number of visits for each arm (mean ± s.e.m.). Intertrial interval, 180 min. *P < 0.05 compared with the other two arms (Scheffè post hoc test).
