infusion of isoproterenol and epinephrine , but not of norepinephrine , acutely increased mnl beta-ar density , and this was blocked by the beta 2-selective antagonist ici 118,551 but not by the beta 1-selective antagonist bisoprolol , suggesting a beta 2-ar-mediated effect .
C0014563
epinephrine
C0028351
norepinephrine