Nitric oxide not carbon monoxide mediates nonadrenergic noncholinergic relaxation in the murine internal anal sphincter.
Rattan S, Regan RF, Patel CA, De Godoy MA. Nitric oxide not carbon monoxide mediates nonadrenergic noncholinergic relaxation in the murine internal anal sphincter. Gastroenterology. 2005 Dec; 129(6):1954-66.