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Expression of CPP. Time spent in checkered compartment (cocaine paired) versus white compartment (saline paired) in drug-unpaired and drug-paired animals on final test day. *p < 0.01; Wilcoxon signed-ranks test. Baseline means for checkered compartment (308.6 ± 18.3 sec) and white compartment (313.6 ± 16.2 sec) did not differ significantly (p > 0.05).
