To the extent that melanotan II produces melanogenesis, this is thought to be caused by activation of the MC1 receptor, whereas its clinically documented sexual effects are thought to be related to its ability to activate the MC4 receptor (though the MC3 is thought to possibly also be involved)
Global, regional, and National comparative risk assessment of 84 behavioural, environmental and occupational, and metabolic risks or clusters of risks for 195 countries and territories, 19902017: a systematic analysis for the global burden of disease study 2017
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Molecular characterization, regulation, heterologous expression, and enzyme properties
Diabetes Obes Metab (2020) 23(4):10526