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Cytotoxicity profile of propolis extracts in human immortalized keratinocyte (HaCaT) cells. Cells were incubated for 24 h with increasing concentrations (0–200 μg/mL) of each propolis extract: PR_1b (a) and PR_9b (b). Cell viability was determined by the SRB assay. The results are shown as the mean ± SD of three independent experiments.
