Fig. 2
The effect of 20 μM MG132 on cell concentration was evaluated in cells challenged with metals. Cultures initially contained 105 cells (represented by the horizontal line) and were either untreated or treated with cadmium, nickle, or zinc; cell concentration was measured 48 h later. Shown are the means and standard errors of five replicates, which are representative of at least two other experimental replicates. Asterisks represent a significant difference (p < 0.05) between treatments at each time point