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The preference index (PI) were significantly higher than 50% (chance) in the control, AA, 5-FU+AA (preventive), and 5-FU+AA (throughout) groups (*p<0.05, A), whereas the PI in the 5-FU and 5-FU+AA (recovery) groups did not deviate significantly from chance (p>0.05). Total exploration time of the familiarization and choice trials (B) did not differ significantly among the various groups (p>0.05).
