Pentapeptide-18, a delta opioid agonist, is a degradation resistant long-acting Leu-enkephalin.A new anti-wrinkle peptide. Mimicking the natural enkephalin mechanism in vitro: outside the nerve cells, binding to the enkephalin receptor, the ligand binds to the receptor, the conformational change initiates a cascade within the nerve cell, the activity of the nerve cells is "down-regulated" and the release of acetylcholine is adjusted, muscle contractions will slow down and therefore wrinkles wil
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