the radioligand [ 125iodo ] - ( -- ) -cyanopindolol was used for the labelling of beta-adrenoceptors and the selective beta-adrenoceptor blocking agents ici 89-406 ( beta 1-antagonist ) and ici 118-551 ( beta 2-antagonist ) were utilized to differentiate both subclasses unequivocally . beta-adrenoceptors in rat kidney were found to be almost exclusively beta 1 .
C0034783
adrenoceptor
C0001643
beta-adrenoceptors