Fig. 4.
Biocompatibility of MNs. (A to C) The fluorescence images of (A) 3T3, (B) HaCaT, and (C) HUVECs incubated with MNs for different times. (D) The CCK-8 test of cell lines with MNs for different times. Scale bars: 100 μm. OD, optical density.
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