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Cytotoxicity evaluation of free TCPP, UCNP@ SiO2@FA/PEG, and UCNP@ SiO2@FA/PEG/TCPP under normoxic or hypoxic conditions with or without laser irradiation (660 nm, 30 min, 10 mW/cm2 for free TCPP; 808 nm, 30 min, 1.5 W/cm2 for others). Data are presented as means ± SDs (n = 7). * p < 0.003 over Laser(−) and ** p < 0.001 over Laser(−).
