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(a) Cytocompatibility of different concentrations (0.1–2 M) of ethanol on HeG2 and HeG2/CYP2E1 cells. (b) Cytocompatibility of emodin and chrysophanol on HepG2/CYP2E1 cells. Different concentrations of compounds were applied to the cells for 48 h, and cell viability was assessed by MTT assay as described in the text. Results are means ± standard error of three independent experiments.
