Figure 2. Prussian blue staining and iron quantification.

(A): ADSCs were incubated for 12 h with varying iron concentrations of USPIO nanoparticles. Iron particles are stained blue (×200), scale bars: 100 μm. (B): quantitative analysis of iron oxides, the iron content per cell was detected by ICP-MS, the iron uptake increased with iron concentrations at a range of 5–100 μg/mL, *p < 0.05.