Figure 5. Effect of 30 micro gram Nomega-nitro-L-arginine (L-NA) administered intrathecally after nerve constriction injury on the development of thermal hyperesthesia induced by the injury in the posttreatment study. The group given vehicle after injury is presented for comparison. Each point represents the mean plus/minus SEM of eight rats. Ordinate difference score (DS); abscissa days after the nerve constriction injury. *P < 0.05 compared with presurgery (day-0) value in the same group.