Figure 3From: Analysis of gene expression changes in relation to toxicity and tumorigenesis in the livers of Big Blue transgenic rats fed comfrey (Symphytum officinale)Principal component analysis for gene expression profiles from livers of control and 8% comfrey-fed rats. No specific cut off was applied and the intensity of whole rat genome data was used. The red and blue dots indicate control and comfrey-treated samples, respectively.Back to article page