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. Author manuscript; available in PMC: 2020 Sep 3.
Published in final edited form as: ACS Appl Mater Interfaces. 2018 Oct 4;10(41):34954–34964. doi: 10.1021/acsami.8b12355

Figure 4.

Figure 4.

MTT assay of HeLa cell viability after incubation with the NOTA–FI–PEG–PEI–Ac–Mn3O4 NPs or the NOTA–FA–FI–PEG–PEI–Ac–Mn3O4 NPs at the Mn concentration of 5–100 μg/mL for 24 h. HeLa cells incubated with PBS were used as a control.