Description_x000D_ Amino Acid Sequence_x000D_ Ac-Ser-Tyr-Ser-Met-Glu-His-Phe-Arg-Trp-Gly-Lys-Pro-Val-NH2_x000D_ Application_x000D_ α-melanocyte-stimulating hormone (MSH-α) is a neuroimmunomodulatory anti-inflammatory peptide with anti-microbial properties. Labelled and unlabelled D-Arg analogues such as [Nle4,DPhe7]-Biotinyl-α MSH and [D-Phe7]-MSH-α are used as α-MSH antagonists.