Figure 5: Mutagenicity of P. strombulifera crude extract. Revertant colonies of TA98 and TA100 strains of S. typhimurium at different concentrations of extract are presented. Mutagenic capability is evident by bacterial colony growth in agar. Results are shown as mean ± SEM of the absolute number of colonies per plate using one-way ANOVA and Dunnett’s post-test for multiple comparisons, (*) p<0.05. Pictures A and B show positive colonies at 0 and 500 μg/ml extract concentration in TA98, while C and D show same concentrations in T100.