Figure 1: Viability of KB cells treated at different time exposures (24, 48 and 72 h). (A) Cells were treated with Chilean propolis ethanolic extract (80 μg/ml) in the presence or absence of 10 μM SnCl2 or 15 μM SnMP. (B) Cells were treated with different concentrations (5-50 μM) of tricarbonyldichlororuthenium (II) dimer (CORM-II). Each value represents the mean ± SD of three separate experiments performed in duplicate. (*p<0.001 vs. Control; **p<0.001 vs. Propolis; ***p<0.001 vs. Propolis + SnCl2).