Epinephrine-induced contractions (upper panel), acetylcholine-induced endothelium-dependent relaxation (middle panel), and sodium nitroprusside (SNP)-induced endothelium-independent relaxations (lower panel).■, control; ○, control + PJ34; □, diabetes; ●, diabetes + PJ34. Each point of the curve represents the mean ± SE of five to eight experiments in vascular rings. *p < 0.05 versus control; #p < 0.05 versus diabetes. Reproduced with permission from 72.