to identify the predominant subtype of beta-adrenergic receptor , competitive inhibition curves utilizing 125i-cyanopindolol ( 125i-cyp ) as the radiolabel versus isoproterenol , epinephrine , and norepinephrine were generated in membrane preparations from calf heart ( predominant beta 1 ) , calf lung ( predominant beta 2 ) and calf coronary artery .
C0014563
epinephrine
C0028351
norepinephrine