“ Nitro-L-arginine , a nitric oxide synthase … methacholine, bradykinin, and arachidonic acid and shifted the EC50 (control versus nitro-L-arginine) to each (1 x 10(-7) versus 3 x 10(-… 10(-10) versus > 10(-9) mo1/L, and 3 x 10(-7) versus > 10(-6) mo1/L, respectively).”