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Trypan Blue Assay for assessing cell mortality in HeLa, SKBR and MCF 7 cells incubated with PEG-DSPE (control) and various O-GNR-PEG-DSPE (10–400 μg/ml) concentrations for 12 hours. Data are presented as mean ± SD (n = 4 per group). * = p < 0.05 for two particular groups.