the molluscan neuropeptide , phe-met-arg-phe-nh2 ( fmrfamide ) , the mammalian opioid peptide met-enkephalin , and their common analogues , met-enkephalin-arg6-phe7 ( yggfmrf ) and tyr-gly-gly-phe-met-arg-phe-amide ( yggfmrfamide ) , were injected into the lateral ventricle of the rat ;
C0027895
neuropeptide
C0205753
opioid peptide