presynaptic alpha 2-adrenoceptor mechanisms in electrically stimulated longitudinal muscles of ilea isolated from 3 , 10 , 20 and 47 week-old guinea pigs were studied by analysis of the concentration-response curves of noradrenaline , a full agonist , and clonidine , a partial agonist , and the scatchard plot of specific binding of [ 3h ] -p-aminoclonidine to synaptosomal fractions from the longitudinal muscle of guinea pig ileum .
C0009014
clonidine
C0048038
synaptosomal