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Performance of old mice in novel object recognition and open field tests in self-comparison study. Eighteen-month old C57BL/6 mice were used in the test. (A) Novel object recognition. (B) Travel distance in open field. (C) Time spent in specific regions in open field. Results in all three panels are mean ± S.D. (n = 20 for the control group and = 21 for the surgery group).
