Figure 6: Involvement of the death receptor pathway in baicalein-induced apoptosis. Flow cytometric analysis of (a) Fas, (b) FasL, (c) DR4, and (d) DR5 expression levels following 24 h of various concentrations of baicalein exposure. The mean fluorescence intensities for each death receptor/ligand expression were tabulated. The data are represented as the mean ± SD in duplicate tests. The data are representative of three independent experiments showing similar results. *, compared with the untreated control group. **, compared with the untreated control group.