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Relaxation effect of P. quadrangularis (Pq) in rat aorta. Concentration-response curves for P. quadrangularis (Pq) in endothelium intact (control) and endothelium denuded (endo-denuded) aortic rings (A), in presence of 10−4 M Nω-nitro-L-arginine methyl ester (L-NAME); (B), and 10−4 M 1H-(1,2,4)oxadiazolo[4,3-a]quinoxalin-1-one (ODQ) in the intact aorta (C). Data are the average ± SEM of 5 independent experiments. *** p < 0.001 vs. control (intact aorta).
