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Phototoxicities determined by CCK-8 assay of (a) HeLa and (b) NIH3T3 cells treated with each sample (equivalent Ce6 10 μg/mL) and free Ce6 (10 μg/mL) under environment with CoCl2 or without CoCl2 for 2 h with light irradiation (for 10 min at light intensity of 5.2 mW/cm2 using a 670 nm laser source) (n = 7, as multiple experiments, ** p < 0.01 compared to free Ce6).
