“ Vasodilatory activity was also reduced in endothelium‐intact aortic rings that had been pretreated with Nω‐nitro‐l‐arginine methyl ester hydrochloride (l‐NAME), a nitric oxide synthase inhibitor and 1H‐[1,2,4]oxadiazolod[4,3‐a]quinoxalin‐1‐one (ODQ), a guanylate cyclase inhibitor.”