Figure 2From: Analysis of gene expression changes in relation to toxicity and tumorigenesis in the livers of Big Blue transgenic rats fed comfrey (Symphytum officinale)Liver cII mutant frequencies in control and 8% comfrey-fed rats. The data represent the means ± SD from groups of 6 rats. *Significantly differed from control group (P < 0.001).Back to article page