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Locomotor activity of rats measured on A) Preconditioning and B) Postconditioning days of the CPP paradigm. GK rats exhibited lower locomotor counts on both days as compared to SD and Wistar rats. Data presented as mean (± S.E.M.) of distance traveled in centimeters. n = 12 rats per group. Asterisks represent a significant difference from the SD and Wistar rat strains (p < 0.05).
