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Confocal microscopy images of (A) HeLa, (B) HepG2, (C) HEK-293, and (D) CHO cells incubated with the MNPs. Nucleus stained with DAPI (blue). Red bar indicates 20 µm in the images. Flow cytometry analysis results of fluorescence signals collected in (E) HeLa, (F) HepG2, (G) HEK-293, and (H) CHO cells after treatment with the MNPs in the absence and presence of biotin for different time periods. Cells without any treatment were regarded as control groups.
