Figure 5: Semi-quantitative analysis of hepatic vascular endothelial growth factor (VEGF) expression during DENA-initiated hepatocarcinogenesis in female Sprague-Dawley rats. One thousand cells were counted per animal and the results were based on 4 animals per group. Each bar represents the mean ± standard error (n = 4 livers). aP<0.001 as compared to normal group; bP<0.001 as compared to DENA control.