Abstract
The 6-nitrodopamine (6-ND), a product of nitric oxide (NO)-dependent "nitration" of dopamine (DA), is produced endogenously, and increasing evidence shows its role as the most potent mediator of in vivo and in vitro chronotropism in rats, as well as the spasmogenic activity of the vas deferens in rats and humans. Despite being the catecholamine released in greater quantities from the stud…