Fig. 4From: The effect of aging on the repeated-dose liver micronucleus assay using diethylnitrosamineKi-67 positive cells in rats of 8 or 10 weeks of age after treatment with DEN for 14 days. The data are shown as mean ± SD (n = 5). *p < 0.05, ***p < 0.001, significantly different from the negative control groupBack to article page