Figure 7. Influence of DAMGO and U50,488 H (10 sup -8, 10 sup -6 M) on small pial arteries and arterioles before (control) and after fluid percussion brain injury, and after fluid percussion brain injury in polyethylene glycol superoxide dismutase and catalase-pretreated animals (n = 5). *P < 0.05 compared to corresponding control value;(dagger)P < 0.05 compared to corresponding fluid percussion injury value.