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Characteristics of SeNPs. A TEM images showed the intuitional characteristic of SeNPs. B The element mapping of Se and S elements in SeNPs. C, D XPS confirmed the presence of C, N, O, and Se in SeNPs. E Peak fitting analysis of Se in XPS. F The average hydrodynamic particle diameter of SeNPs. G FT-IR showed two characteristic peaks at 3267 cm− 1 and 1634 cm− 1, respectively. H SeNPs (labeled with cy5) entering NPCs at different concentrations were observed
