stimulation of rat pinealocyte cyclic gmp by beta-adrenergic agonists ( in the presence of prazosin to block alpha 1-adrenoceptors ) showed an identical potency order ( isoproterenol greater than epinephrine = norepinephrine much greater than salbutamol greater than terbutaline ) to the stimulation of pinealocyte cyclic amp .
C0014563
epinephrine
C0028351
norepinephrine