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[D-Trp8]-γ-MSH acetate is a selective melanocortin 3 (MC3) receptor agonist (IC50 = 6.7, 340 and 600 nM for human MC3, MC5 and MC4 receptors, respectively). It displays antiinflammatory efficacy in mice bearing a non-functional MC1R (recessive yellow e/e mouse) and these effects are abrogated in the presence of the HO-1 inhibitor ZnPPIX.