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Cell viability of C12-PEI/SPIO, C12-PEI-LAC6.8%/SPIO, C12-PEI-LAC11.7%/SPIO in RAW 264.7 cells was evaluated by CCK-8 assay. Results were expressed as the mean ± SD, n = 3; *(P < 0.05), **(P < 0.01), ***(P < 0.001) vs. C12-PEI/SPIO alone group.
