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Understanding Melanotan-1 Mechanism and Receptor Selectivity Melanotan-1 (afamelanotide, [Nle4-D-Phe7]--MSH) is a synthetic analog of alpha-melanocyte-stimulating hormone (-MSH), engineered with amino acid substitutions at positions 4 and 7 that increase receptor binding affinity and extend serum half-life to approximately 33 minutes following subcutaneous injection
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