a series of adrenergic agonists competes with [ 125i ] icyp for binding with an order of potency suggesting beta 2 subselectivity ; isoproterenol ( 0.73 microm ) greater than epinephrine ( 15 microm ) greater than norepinephrine ( 71 microm ) .
C0014563
epinephrine
C0028351
norepinephrine