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Table 1 Endogenous opioid peptides and their precursors

From: Molecular and cellular mechanisms of the age-dependency of opioid analgesia and tolerance

Opioid Peptide Precursor
β-Endorphin Pro-opiomelanocortin
Met-enkephalin Pro-enkephalin
Leu-enkephalin Pro-enkephalin
Octapeptide Pro-enkephalin
Heptapeptide Pro-enkephalin
Dynorphin 1-8 Pro-dynorphin
Dynorphin 1-17 Pro-dynorphin
α-Neoendorphin Pro-dynorphin
β-Neoendorphin Pro-dynorphin
Nociceptin Prepro-nociceptin
Bocistatin Prepro-nociceptin