Figure 5. Effect of increasing concentrations the MnIII-3 porphyrin compound on HeLa cells viability as a function of time. HeLa cells were plated in 96-well plates at a density of 2x104 cells per well. Twenty-four hours after plating, the cells were incubated with 0.25, 0.5, 1.0, 1.5, 2.0, 2.5, 3.0 and 5.0 mM solutions of MnIII-3. Cell viability was measured after 2, 4 or 24 h using the Alamar blue assay. Cell viability is presented relative to the percentage of untreated cells (control cells) considered as 100%. Data represent the mean ± SD of three independent experiments. Pairwise data comparisons were performed between cell viability values obtained with each MnIII-3 concentration, as compared with the immediately precedent concentration, for each incubation period (non-significant) and between cell viability values obtained for each incubation period with MnIII-3, as compared with the immediately precedent incubation period, for each concentration (**p<0.01, *p<0.05). The significance of the results was statistically
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