npy produced a concentration-dependent inhibition of nicotine-stimulated norepinephrine and epinephrine release from bovine chromaffin cells with ic50 ( concentration of npy which inhibits 50 % of maximum release of catecholamines ) values of 1.8 x 10 ( -9 ) m and 1.7 x 10 ( -9 ) m , respectively .
C0028351
norepinephrine
C0014563
epinephrine