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Determination of the cytotoxicity of TOF in RAW 264.7 (A) and MDCK (B) cells. TOF was added to cells with indicated concentrations for 24 h at 37 °C. Cell viability was examined according to the CCK-8 assay kit. The data represent the mean ± SD based on three replicates in three different experiments. *p< 0.05, ⁎⁎p< 0.01, and ⁎⁎⁎p< 0.001.
