Fig. 1. Number of viable cells after 63 h of intermittent exposure (3 h On/3 h Off) to the MF, in the presence of 1 µM erlotinib or 0.0 µM (vehicle). The data, normalized over the corresponding controls, are means ± SEM of four experimental replicates. *: 0.01 ≤ p<0.05; **: 0.001 ≤ p<0.01 (ANOVA and Student's t test).