The correlation between the number of internalized MNPs and cell viability.

<p>The three data points for each cell type represent the three incubation times (8, 12, 24 h) with MNPs. The ratio of survival to total cell number was regarded as viability (PI-positive cells with cell necrosis or late apoptotic nuclei were regarded as dead cells). The error bars represent the standard deviations (SD) obtained from three independent replicates. The correlation between the mean MNPs number obtained from magnetophoresis and the viability of the cells was determined by linear regression.