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Cytotoxicity evaluation of HS and EX in MRC5 cells after 24, 48, and 72 h treatment by performing classic MTT assay. The data represent the mean ± standard deviation (SD) of three independent experiments. The graph showed high survival of MRC5 cells at all doses tested except for 10.0 mg/mL and 5.0 mg/mL of EX at 48 h and 72 h.
