the potencies which isoproterenol , epinephrine , salbutamol , and norepinephrine competed with [ 3h ] dihydroalprenolol binding sites indicted that adrenergic receptors of the capsular and the decapsulated membranes were of the beta 2-type . beta-adrenergic stimulation of the adenylate cyclase system was observed only in the capsular fraction .
C0014563
epinephrine
C0028351
norepinephrine