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Enkephalins
Peptides that bind to opioid receptors in the brain and gastrointestinal tract.
Endogenous pentapeptide opioids (met-enkephalin, leu-enkephalin) that modulate pain perception and gut motility through opioid receptor signaling.
How one textbook covers it
Advanced Nutrition and Human Metabolism, 8th ed. (Gropper) — Glossary
Endogenous pentapeptide opioids (met-enkephalin, leu-enkephalin) that modulate pain perception and gut motility through opioid receptor signaling.