rat neurointermediate lobes and neurohypophyses separated from the pars intermedia were stimulated in vitro in the presence of either d-ala2 , d-leu5-enkephalin ( dadle ) , a leu-enkephalin stable analogue or fk 33-824 a met-enkephalin stable analogue .
C0014298
enkephalin
C0014295
met-enkephalin