a group of centrally acting clonidine-like drugs are classified in terms of their selectivity for the alpha 2-adrenoreceptors , and it is suggested that differences between alpha-adrenoreceptors in various tissues may allow development of highly selective alpha 2-adrenoreceptor agonists for specific tissue sites such as the juxtaglomerular cells and brainstem nuclei controlling blood pressure .
C0034784
alpha-adrenoreceptors
C0001639
alpha 2-adrenoreceptor