Effect of rECP, staurosporine, and thapsigargin on cell cycle progression. BEAS-2B cells were incubated in the presence or absence of 20 μM rECP, 0.1 μM staurosporine (STS) or 1 μM thapsigargin (TG) for 24 h. Cells were stained by PI, and DNA content was analyzed by FACS. The proportion of sub-G1 cells was analyzed in each treatment. All data represent the arithmetic mean ± SEM. *P < 0.05, ***P < 0.001.