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Cell viability assay of FEE on PBMC following 48 h incubation period. Different concentrations of FEE of 12.5, 25, 50, 100, 200, 300, and 400 µg/mL were used to treat PBMC, and MTT was utilized to determine the cell viability. IC50 was determined as the mean ± standard deviation (SD) of three independent experiments.
