FIG. 1.

Effect of selected plant extracts (Phlomis viscosa, Withania somnifera) on cell growth in human foreskin fibroblasts (HFF; continuous line) and ovarian carcinoma SKOV3 cell (dashed line) cultures. The concentrations of the stocks were 30 and 25.2 mg/mL for the P. viscosa and W. somnifera extracts, respectively. The number of viable cells was measured by the Neutral Red assay and expressed as percent of control (untreated) cells. Each point represents the mean of five to six replicates. The standard errors of the means were less than 6% and as such were not indicated on the graph. Differences between treated and control cultures and between HFF and SKOV3 were highly significant (p<0.001; analysis of variance [ANOVA]).