the order of agonist competition for the binding site was epinephrine ( ki = 0.92 +/- 0.32 microm ) greater than or equal to norepinephrine ( ki = 2.2 +/- 1.0 microm ) greater than isoproterenol ( ki = 137 +/- 17 microm ) , consistent with an alpha-adrenergic interaction .
C0014563
epinephrine
C0028351
norepinephrine