Fig. 1. Prussian blue staining of human mesenchymal stem cells with or without superparamagnetic iron oxide nanoparticles labeling. (A) Prussian blue-stained unlabeled human mesenchymal stem cells (×400). (B) Prussian blue-stained labeled human mesenchymal stem cells (×400). Note the abundant iron particles (blue dots) in the cytoplasm of the cells (arrow).
