basal release of lhrh was increased by the antagonist naloxone , which shows some mu-receptor selectivity , in a manner which was reversed by the mu-receptor specific agonist [ d-ala2 , n-phe4-gly-ol5 ] -enkephalin ( dago ) and the mu- and delta-specific agonist [ d-ala2 , n-phe4 , met ( 0 ) ol5 ] -enkephalin ( fk 33-824 ) .
C0525773
dago
C0014298
enkephalin