in the present study , we examined the effects of central administration of met-enkephalin , leu-enkephalin , the enkephalin analogue fk-33824 , and the opiate antagonist naloxone , and the effects of systemic administration of met-enkephalin and fk-33824 on avp secretion in conscious normal sheep .
C0014298
enkephalin
C0014295
met-enkephalin