Biological Activity Prototypical selective δ-opioid receptor agonist peptide. Inhibits electrically stimulated contraction of mouse vas deferens in vitro (EC50 = 5.2 nM), and is antinociceptive in vivo.
(Modifications: X = D-Pen, Disulfide bridge between 2 - 5)
Soluble to 1 mg/ml in water
Desiccate at -20°C
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