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Histogram of cellular iron uptake of A459 cells without any treatment (green) and those incubated with AgA-SPIONs (red) and HA-SPIONs (blue), cells with no particles treatment as control (green), at 1 h, 4 h, 8 h and 20 h incubation, at 37 °C, 5% CO2. (* means the mean of the group is significantly different from the other two groups at p = 0.05 level) (n ≥ 5).
