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Cell viability (MTT assay) of HeLa cells exposed to the PSs in solution BDP2 (A) and BDP4 (C) and to their corresponding nanosystems BDP3-NP (B) and BDP5-NP (D) under dark conditions (blue bars) and after green irradiation at 10 J/cm2 (orange bars). Stars indicate significant differences with respect to controls. Asterisks indicate significant differences between dark and light conditions at the same concentrations tested.
