Figure 2.

(a) Apoptosis of Eca-109 cells was detected by Annexin V-PE/7-AAD staining assay after coincubation with different concentrations (0, 20, and 40 μM) of complex 2 for 24 h. (b) Quantitative data analysis for the number of cells (% of total) in apoptosis for different treatment groups. Data were presented as mean ± SD (n = 3), Student's t-test, ^∗∗P < 0.01.