Figure 4
Mutation fractions at redBA/gam loci in MEF cells exposed to either TiO 2 particles or C 60 at a dose of 10 μg/ml either in the presence or absence of Nystatin (10 U/ml), an endocytosis inhibitor. Results were expressed as the total number of confirmed λ mutants divided by the total number of rescued phages. The average number of preexisting mutants per 106 plaques used for these experiments was 5.69 ± 1.87. Data were pooled from 3 independent experiments. Bars, ± SD.