however , the densities of beta- , alpha 1- , and alpha 2-adrenoceptors and [ 3h ] nitrendipine receptors of coronary artery were 258 , 12 , 12 , and 561 fmol/mg protein , respectively , while those of aorta were 37 , 525 , 1,000 , and 215 fmol/mg protein . beta-adrenergic agonists competed with [ 3h ] ( - ) dihydroalprenolol binding sites in coronary artery , the order of potency being ( - ) isoproterenol greater than ( - ) norepinephrine greater than ( - ) epinephrine greater than ( + ) isoproterenol .
C0028351
norepinephrine
C0014563
epinephrine