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Contents: Scientific and Research Studies Modulation of Melanocortin-1 Receptor Signaling Pathways in Melanocyte Photoprotection M1 Interactions within the Melanocortin Receptor Network M1 Role in Photosensitivity Associated With Erythropoietic Porphyria M1 Role under Ultraviolet Radiation Exposure Pharmacological Characterization of MC1R Signaling Beyond Pigmentation Pathways Emerging Conceptual Links Between MC1R Agonism and Neuromelanin Related Processes References M1 Scientific Research and Studies Modulation of Melanocortin-1 Receptor Signaling Pathways in Melanocyte Photoprotection The melanocortin-1 receptor, MC1R, is a Gs protein coupled receptor predominantly expressed on melanocytes and is considered to play a central role in pathways associated with pigmentation and ultraviolet stress responses