Pentapeptide opioid — YGGF is the classic motif.
Part of the Neuropeptides & signaling cluster
Overview
Met-enkephalin (YGGFM) is an endogenous opioid pentapeptide foundational to pain and reward neurobiology research.
Source & context
Biological / chemical source: Brain, adrenal
Primary research or clinical context: Pain & reward research
Opioid peptide family
Enkephalins, endorphins, and dynorphins share related motifs and receptor preferences — a core chapter in neuropeptide education.
Sequence
One-letter sequence commonly cited for Met-enkephalin (educational; isoforms and modifications may differ):
FAQ about Met-enkephalin
What is Met-enkephalin?+
Met-enkephalin (YGGFM) is an endogenous opioid pentapeptide foundational to pain and reward neurobiology research.
Is Met-enkephalin an approved medicine?+
Met-enkephalin is discussed here as a research / educational topic. Pain & reward research. This is not medical advice.
What is the typical length of Met-enkephalin?+
Met-enkephalin is commonly described as approximately 5 amino acids (Neuropeptide).