Figure 5: Depicts conditioned place preference among mice that are not-conditioned (left panel) and those conditioned to cocaine (10 mg / kg, s.c.; n = 24) or U50,488 (0.3 mg / kg, i.p.) 15 min prior to cocaine (10 mg / kg, s.c.; n = 15; right panel). *indicates significant difference from pre-conditioned group (p < 0.05). † indicates significant difference from cocaine (10 mg / kg, s.c.)-conditioned group (p < 0.05).