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Cell viability of CAL27 and SQD9 cells after 24 h from 45 min treatment with increasing concentration of mTHPC/PBS or mTHPC@HSA and in presence or absence of 45 min of light irradiation. * p < 0.05, **** p < 0.0001 compared to untreated cells; ## p < 0.01, ### p < 0.001 compared to the same concentration of treatment with mTHPC/PBS.
