Figure 5. Proliferating cell nuclear antigen (PCNA) labeling index (%) of colonic mucosa in F344 rats. Group 1 was the untreated control, group 2 had the highest index, while groups 3-6 demonstrated the significant inhibitory effect of dietary Capsosiphon fulvescens (**p<0.01) and Hizikia fusiforme (*p<0.05) on PCNA labeling index compared to group2. The data represent the mean±standard error of the mean.