Fig. 1From: The effect of aging on the repeated-dose liver micronucleus assay using diethylnitrosamineBody-weight changes in rats treated with DEN for 14 days. A: Six weeks of age at the start of dosing, B: Eight weeks of age at the start of dosing. The data are shown as mean ± SD (n = 5). *p < 0.05, **p < 0.01, significantly different from the negative control groupBack to article page