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Intracellular ROS level induced by positive control and SWCNTs. Generation of ROS was determined by relative DCF fluorescence value compared to control group. (a) S-L, S-L-COOH and S-L-OH; (b) S-S, S-S-COOH and S-S-OH; (c) Positive control ROSup (50 mg/L, 20 min treatment). All the data are shown as the mean ± standard deviation. The differences among groups were identified by one-way ANOVA followed by Tukey post hoc test. *Indicates the p-value < 0.05.
