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Novel‐object recognition in unoperated rats. Exposure 1 shows the difference of discrimination ratio between Object 1 and Object 2. Exposure 2 shows the difference of discrimination ratio between the Familiar object and the Novel object. Low dose: 50 mg/kg of paracetamol, High dose: 300 mg/kg of paracetamol. Error bars indicate SEM (n = 6). **P < .01 (Bonferroni‐corrected t test)
