Fig. 2.
Mesenchymal stem cells (MSCs) using ferumoxides–PLL. Cells were labeled for 48 h (a, b) or 24 h (c) with 25 mg Fe/ml Feridex and 375 ng/ml PLL. DAB-enhanced Prussian blue stain of labeled human (a), porcine (b), and canine (c) MSCs show an efficient intracellular uptake of particles into endosomes that is nonspecific across species. (Adapted from Bulte and Kraitchman (5) with permission.)