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MC1R / Pigmentation and Photoprotective Signaling PT-141 retains MC1R binding activity, and studies have characterized its capacity to activate the cAMPPKAMITF axis in melanocytes, driving tyrosinase upregulation and eumelanin synthesis, consistent with the signaling profile shared across the MT-2-derived melanocortin agonist class (Hadley & Dorr, Peptides, 2006)

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Individual variation in GLP1R receptor density and sensitivity may influence severity