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Gecele M, Francesetti G, Meluzzi A

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The lactam bridge between Asp5 and Lys10 side chains cyclises the heptapeptide backbone and constraining it into a compact, conformationally rigid structure that stabilises the receptor-binding pharmacophore conformation required for high-affinity MC3R and MC4R engagement

But when you compare the two in terms of free-radical scavenging potency, astaxanthin is the winner with 550 times more antioxidant activity than vitamin E [16]