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In vitro cell toxicity test OTA on liver cells (LX2). (A) OTA effects on LX2 cells at 24 h, (B) OTA vs. LX2 cells at 48 h, (C) LX2 vs. OTA final product in 24 h, (D) LX2 vs. OTA in 48 h. Each set of data shows the mean ± SD of the three independent experiments. *, **, ***, **** indicates a significant difference between OTA and control at p < 0.05, p < 0.01, p < 0.001, and p < 0.0001. ns: not significant.
