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Effect of propolis on the cell viability of differentiating SH-SY5Y cells. The cells were treated with propolis for 48 hr in the presence of RA (10 μM). Then, the viability of SH-SY5Y cells was determined by MTT assay. The percentage of viable cells was calculated by defining the viability of cells without RA and propolis treatment as 100%. Data are expressed as the mean ± standard error obtained from four independent experiments.
