Figure 4From: Analysis of gene expression changes in relation to toxicity and tumorigenesis in the livers of Big Blue transgenic rats fed comfrey (Symphytum officinale)Volcano plots (log2 fold change vs. -log2 P -value). A gene was identified as significantly changed if the fold change was greater than 2 (up or down) and the P-value was less than 0.01 in comparison to the control group. Each group consisted of 5–6 replicates.Back to article page