in rat central nervous system , 3h-prazosin and 3h-clonidine bind to two different classes of alpha-adrenoceptors : - 3h-prazosin binds to alpha1-adrenoceptors with high affinity ( kd 25 degrees c = 0.30 nm ) with a number of binding sites of 81.6 fmoles/mg of protein .
C0034784
alpha-adrenoceptors
C0001638
alpha1-adrenoceptors