the alpha 1-adrenoceptor blocker prazosin ( 5.0 x 10 ( -7 ) mol/l ) and the alpha 2-adrenoceptor blocker yohimbine ( 5.0 x 10 ( -7 ) mol/l ) were used to determine which subtype of alpha-adrenoceptor is responsible for the effects .
C0001639
alpha 2-adrenoceptor
C0034784
alpha-adrenoceptor