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(A) Representative confocal images of normal and abnormal spindles and DNA. (B, C) The ratio of abnormal spindle and misaligned chromosome at 0 h, AGED-24 h, AGED+NMN-24 h, AGED-48 h and AGED+NMN-48 h oocytes. *p < 0.05, **p < 0.01 indicated significant differences. Scale bars represented 2 μm.
