Although there was a slight increase in p53 levels after GFP transfection compared with control, there was no significant difference in cyclin B, cyclin D, and cyclin E expression between GFP-transfected and control cells following combined stimulation. The upregulation of hCdc14A increased the expression of cyclin B, cyclin D, cyclin E, and p53 significantly compared with GFP-transfected cells. n = 3; # p b 0.05 vs. GFP-transfected cells. Con, control.