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Cytotoxicity evaluation of QD@SiO2@PE-PEG compared with SiO2@PE-PEG (no QD doping). Dose-dependent viability evaluation of LNCaP cells treated with QD@SiO2@PE-PEG (red) and SiO2@PE-PEG (blue) of the same size. The toxicities of the two samples exhibit nearly identical trend of dose-dependent behavior, indicating that the toxicity is due to the colloidal particles, but not the QDs doped inside.
