Fig. 4. Cytotoxicity against HeLa cells.
The viabilities of HeLa cells treated with different concentrations of Os2 or Os1 under normoxia (20% O2, a, b) or hypoxia (1% O2, c, d) in the dark or upon light irradiation. All cell viability data was performed as duplicates of quadruplicate (n = 4 biologically independent samples). Error bars represent S.D. from the mean. Statistical significance was calculated with two-tailed Student’s t test (*p < 0.05, **p ≤ 0.01 or ***p ≤ 0.001). Incubation temperature: 310 K. Light irradiation: 465 nm, 13 mW/cm2, 1 h.