Fig. 4. Effect of idazoxan (Ida) on clonidine (Clo)–induced facilitation of acetylcholine release from KCl exposure in lumbar dorsal spinal cord slices from spinal nerve ligated rats. Data are expressed as percent of fractional release without drug exposure. Each point represents the mean ± SEM of five experiments. * P < 0.05 versus clonidine-treated group ( P value for analysis of variance = 0.018).