Fig. 2
![Fig. 2](http://media.springernature.com/full/springer-static/image/art%3A10.1186%2Fs12906-018-2397-0/MediaObjects/12906_2018_2397_Fig2_HTML.png)
Effects of COE on the viability of the HCC cells. The HepG2/mTOR+ cells were treated with either 0.1%DMSO as solvent control or different concentrations of COE (20, 40, 80, 160, and 320 mg/L) for 24, 48, and 72 h, respectively, and the cell viability was evaluated with MTT assay. (*P < 0.05, **P < 0.01, ***P < 0.001, compared with the solvent control)