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The uptake of NPs in PLC cells and A549 cells. Fluorescence microscopy analysis of the uptake of Rhodamine B-labeled NPs in PLC cells (a) and A549 cells (b). Scale bar was 50 μm. Fluorescence spectrum analysis of the uptake of FITC-labeled NPs in PLC cells (c) and A549 cells (d). The results were expressed as mean ± SD (n = 3). ***p < 0.001 versus the NP-treated cells within 3 h
