the aim of the present study involving intact and ovariectomized prepubertal ewe lambs was to compare the effects in vivo of an opioid peptide agonist [ d-ala2 , n-phe4 , met ( 0 ) ol5 ] -enkephalin ( fk 33-824 ) and antagonist , naloxone , on concentrations of lh and prolactin in plasma , and levels of neurotransmitter metabolites in cerebrospinal fluid ( csf ) , with their effects in vitro on the release of gonadotrophin-releasing hormone ( gnrh ) and neurotransmitters from isolated median eminences .
C0205753
opioid peptide
C0014298
enkephalin