Relaxation of bovine coronary artery and activation of coronary arterial guanylate cyclase by nitric oxide, nitroprusside and a carcinogenic nitrosoamine.

With CA Gruetter, BK Barry, DB McNamara, DY Gruetter, PJ Kadowitz.

In 1998 Ignarro shared the Nobel Prize in Physiology or Medicine with Robert F. Furchgott and Ferid Murad "for their discoveries concerning nitric oxide as a signalling molecule in the cardiovascular system."