i50s , clonidine ( 0.05 microm ) = p-aminoclonidine ( 0.05 microm ) congruent to epinephrine ( 0.1 microm ) less than norepinephrine ( 2.0 microm ) less than isoproterenol ( 15 microm ) = dopamine ( 15 microm ) , are consistent with the characteristic binding affinities of these adrenergic agonists for alpha 2-adrenergic receptors .
C0014563
epinephrine
C0028351
norepinephrine