Figure 4. Protein expression under different conditions (A) Expression of Nrf2 and HO-1 in GC cells cultured under a hypoxic condition. The graphs show the quantified data of western blots. (B) Expression of Nrf2, HO-1 and HIF-1α in GC cells after they were transfected with siRNAs and cultured under a hypoxic condition. The graphs show the quantified data of western blot. (*P<0.05, **P<0.001).