Fig. 5. Expressions of total extracellular signal–regulated kinase (ERK) and phospho-ERK in the spinal cord. (  A ) Representative Western blot picture. (  B ) Densitometric analysis results expressed in arbitrary units (AU). LY = LY-294002; PD = PD-98059; Postcon A = standard postconditioning; Postcon B = modified postconditioning (low-pressure reperfusion). *P < 0.05  versus control group.