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Cell  viability  was determined  by the MTT assay.
Briefly, cells were plated in 96-well flat-bottomed plates at 5   ¡Á   10 3 cells per well and allowed to grow overnight prior to exposure to MCNs, DOX, or DOX@MCNs with different concentrations, followed by irradiation with red light. After 24 or 48 h of further incubation, the MTT reagent (3-(4,5-dimethylthiazol-2-yl)-2, 5-diphenyltetra-zolium bromide) was added for 4 h at 37  ¡ã  C to allow conversion of MTT to a purple formazan product by active mitochondria. Then the formazan product  was dissolv ed in DMSO and quantifi  ed  by absorption spectrophotometry at 490 nm on an enzyme-labeled instrument  (SUNOSTIK  SPR-960).
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