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ADSCs were co-cultured with USPIO nanoparticles at iron concentrations of 0–100 μg/ml, growth curves of USPIO-labeled ADSCs were obtained by CCK-8 assay. Compared with unlabeled cells, there was no cellular cytotoxicity of USPIO in the iron concentration range of 5–50 μg/ml and cells incubated with PLL alone, p > 0.05, while cell proliferation was inhibited at the iron concentration of 100 μg/ml, p < 0.05.
