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Viability of HL-60 cells after 24 h, 48 h, and 72 h of treatment with SPE-0, SPE-20, SPE-40, SPE-60, and SPE-80 subfractions. Cell viability was assessed by tryptan blue exclusion method and is presented as percentage of control value. Data are expressed as mean ± SD of two independent experiments, each of which was done in triplicate. *P < 0.05, compared with control. Each sample was tested at a concentration of 50 μg/mL.
