Fig. 4

Clonogenic radiation survival curves for FaDu (a and d), CAL27 (b and e) and CAL33 (c and f) cells treated with either AuNPs (100 μg), atovaquone (AQ, 30 μM) or the combination of both under normoxic (a, b and c) and hypoxic (d, e and f) conditions. Two-way ANOVA with Turkey multiple comparison test was used to compare within different treatments. Significant differences are represented by *p < 0.05, **p < 0.01, ***p < 0.001. Data were obtained from three independent experiments performed in triplicate ± SEM