in the present study , evidence that beta 2-adrenoceptors in guinea-pig and rat ventricles are primarily localized on the coronary endothelium is provided by competition binding studies with the subtype-selective beta-adrenoceptor antagonists ici 89.406 ( beta 1-selective ) and ici 118.551 ( beta 2-selective ) on four different plasma membrane preparations .
C0001643
beta-adrenoceptor
C0007603
plasma membrane