The cell cytotoxicity of the ethanol extract and water fraction from Prunella vulgaris var. lilacina against various cancer cell lines. Cells were treated with the ethanol extract and water fraction of P. vulgaris var. lilacina at 10 μg/ml. After treatment for 24 h, cell viability was measured with the MTT assay. Values are the means of three determinations ± SEM. The different letters indicate a significant difference of p < 0.05.