the similarities between the accumulation rate of immunoreactive yggfmrf and of met5-enkephalin induced by haloperidol suggest that haloperidol increases the biosynthesis of the specific messenger rna for preproenkephalin , an opioid peptide precursor , which contains one copy of yggfmrf and several copies of met5-enkephalin .
C0205753
opioid peptide
C0014298
enkephalin