Fig. 6

a FCM profiles displaying cellular uptake of the ANG/Cy7-PEG-SPIONs probes before and after incubation with human serum after culturing for 4 h with bEnd.3 cells; b FCM profiles displaying cellular uptake of the DANG/Cy7-PEG-SPIONs probes before and after incubation with human serum after culturing for 4 h with bEnd.3 cells; c FCM profiles displaying cellular uptake of the ANG/Cy7-PEG-SPIONs probes before and after incubation with human serum after culturing for 4 h with U87-MG cells; d FCM profiles displaying cellular uptake of the DANG/Cy7-PEG-SPIONs probes before and after incubation with human serum after culturing for 4 h with U87-MG cells. Data from at least three independent experiments are shown as the means ± SEMs, n = 3