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Cellular uptake of NEs into 661W cells at different concentrations by fluorescence spectroscopy. Cells were incubated with PLOA-decorated NEs (▲), TPP-coated PLOA-decorated NEs (■), and control NEs (●) for 1 h. Data are expressed as means ± SD, n ≥ 3. The significant difference is indicated as ***p < 0.001.
