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Superparamagnetic iron oxide (SPIO) uptake by hMPCs. hMPCs were treated with SPIO nanoparticles at concentrations of 0–1600 μg/mL and stained for iron (a) directly after SPIO labeling and (b) one passage (9 population doublings) after SPIO labeling. Scale bar is 50 μm. hMPCs, human muscle precursor cells. Color images available online at www.liebertpub.com/tec
