Effects of ERK5-siRNA on apoptosis, proliferation and colony formation. A. The effects of siERK5 at 24, 48, and 72 hs on apoptosis of HL-60 cell lines are shown. B. The effects of siERK5 at 24, 48, and 72 hs on viability of HL-60 cell lines are shown. C. The effects of siERK5 on colony formation of HL-60 cell lines are shown. *P < 0.05; **P < 0.01.