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Serum protein absorption on the nanoparticle surface. (A) ζ-Potential changes of nanoparticles after 24 h incubation with FBS. (B) Electrophoresis gel of SDS-PAGE experiment on the SPIO absorbed with serum proteins. Values are expressed as the mean, n = 6. Bars show SD. ***P < 0.001; ns, not significant
