the order of agonist competition for the [ 3h ] -dha binding site of ddt1 cell membranes was isoproterenol ( ki = 0.20 +/- 0.07 microm ) greater than epinephrine ( ki = 0.4 +/- 0.2 microm ) greater than norepinephrine ( ki = 66.5 +/- 5.15 microm ) consistent with a beta 2-adrenergic receptor interaction .
C0014563
epinephrine
C0028351
norepinephrine