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Group III opioid peptides are derived from proenkephalin B. The processing of this precursor peptide is still only partly understood and we still do not know how many final products come from proenkephalin B and whether Leu-enkephalin is produced from Group III peptides. However, potent biologic activity of Group III opioid peptides and existence of opiate-receptors specific for these peptides (k receptors) strongly suggest that Group III opioid peptides are not precursors of Leu-enkephalin but bioactive substances per se. Further studies should clarify details of the processing of proenkephalin B.
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