Fig. 3.

Photomicrographs of hNSCs treated for 24 hr with three different SPIONs (ferumoxides, MION-47 or CLIO-NH₂) at 25 µg/ml in the presence of different doses of PLL. As the PLL concentration increased in the media from 0.25 µg/ml to 2 µg/ml, more iron oxide nanoparticles are seen inside the labeled cells. (Prussian blue stain, objective magnification: × 40)