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The melanocortin 1 receptor (MC1R), a G(s) protein-coupled receptor, has an important role in human pigmentation. We investigated the regulation of expression and activity of the MC1R in primary human melanocyte cultures. Human β-defensin 3 (HBD3) acted as an antagonist for MC1R, inhibiting the α-melanocortin (α-melanocyte-stimulating hormone(More)
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