Figure 4From: Quantification of the internalization patterns of superparamagnetic iron oxide nanoparticles with opposite chargeRelaxation rates R 2 * of agarose phantoms containing 105cells doped with SPIONs. Data points represent intracellular iron levels after incubation with increasing amounts of γ-Fe2O3-PEI (▪) and γ-Fe2O3-PMA (□), respectively (1, 10, 30 and 50 μg [Fe]).Back to article page