Fig. (2).

Intracellular iron content in L929, RAW 264.7, HepG2, PC-3, U-87 MG, and primary cultured mouse MSCs after 24 hours incubation of SPIO nanoparticles with iron concentration at 4.5 µg/mL. Note: Data were expressed as means ± standard deviations from three experiments. Abbreviations: MSC, mesenchymal stem cell; SPIO@SiO2-NH2, aminosilane-coated SPIO nanoparticles; SPIO@SiO2, SiO2-coated SPIO nanoparticles; SPIO@dextran, dextran-coated SPIO nanoparticles (reproduced with permission from reference 85).