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Cellular uptake of TiO2 NPs by 4T1. (A) Time-dependent (5 µg/mL TiO2 concentration); (B) Concentration-dependent (6 h incubation). Data are expressed as a mean ± SD, (** P < 0.01, * P < 0.05, # P > 0.05, compared to the previous time or concentration used).
