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SRB cytotoxicity assay of FEE on A549 lung cancer cell line (A), and HSF human skin fibroblast normal cell line (B), after an incubation period of 72 h. Different concentrations of 0.03, 0.3, 3, 30 and 300 µg/mL of FEE were used. IC50s values were expressed as mean ± SD of three performed assays.
