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Human osteosarcoma MG-63 cells were incubated with various concentrations (a) control, (b) 6.25 µg ml−1, (c) 12.5 µg ml−1, (d) 25 µg ml−1, (e) 50 µg ml−1, (f) 100 µg ml−1, (g) 200 µg ml−1 of Zn0.5Fe2.5O4/SiO2 for 24 h. The human osteosarcoma MG-63 cells were stained blue at the concentration of 6.25 µg ml−1and the colour became thicker with the increase in NP concentrations.
