characterisation of the pre- and post-junctional effects of agonists and antagonists led to the conclusion that pre- and post-junctional alpha-adrenoceptors differed in receptor structure and alpha-adrenoceptors were sub-divided into alpha 1- and alpha 2-adrenoceptors .
C0034784
alpha-adrenoceptors
C0001639
alpha 2-adrenoceptors