Fig. 2.

Effects of indicated compounds on the cell viability of the SCC15 cells. a Exponentially growing of SCC15 cells was treated with aloe-emodin, rhein and physcion in various concentrations (0, 12.5, 25, 50, 100 and 200 μM) for 48 h. b SCC15 cells were treated with 12.5, 25, 50, 100 and 200 μM of aloe-emodin for various times (24 h, 48 h, 72 h). The cell viability was determined using MTT assay. Each bar represents the mean ± SD