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Cell viability on 8 nm (A–C), 17 nm (D–F), and 24 nm (G–I) Fe3O4 NPs before and after coating HLC for 24 hours, 48 hours, and 72 hours, as determined by CCK-8 assay.
Abbreviations: CCK-8, Cell Counting Kit-8; HLC, human-like collagen; NPs, nanoparticles.
