analysis of these data showed at least two affinity states with apparent kds of 0.34 and 6.0 nm , and the order in which ligands decreased [ 3h ] clonidine binding was clonidine greater than ( - ) -epinephrine greater than ( - ) -norepinephrine greater than yohimbine greater than ( + ) -norepinephrine greater than ( +/- ) -isoproterenol greater than prazosin greater than serotonin .
C0014563
epinephrine
C0028351
norepinephrine