scratching induced by intrathecal ( it ) administration of kainic acid ( 0.5 nmol ) to rats was inhibited by it pretreatment with the selective mu agonists levorphanol ( 30 and 90 nmol ) , [ d-ala2 , n-met-phe4 , gly5-ol ] -enkephalin ( dago , 0.4 and 1.1 nmol ) , or morphine ( 90 nmol ) , the mixed mu-delta agonist [ d-ala2 , d-leu5 ] -enkephalinamide ( dadle , 10 and 30 nmol ) , or the sigma/phenycyclidine ( pcp ) agonists dextrorphan ( 90 nmol ) or ( + ) -n-allyl-n-normetazocine ( [ + ] -nam , 90 nmol ) .
C0014298
enkephalin
C0525773
dago