l-nna concentration-dependently and reversibly antagonized the l-arginine- and nadph-dependent activation of a purified soluble guanylate cyclase ( gc ) by cytosol from freshly harvested porcine aortic endothelial cells , suggesting a direct competition between l-nna and l-arginine at the level of endothelial no-synthesis .
C0068821
l-nna
C0003765
l-arginine