OntologiesgoclassesGO:0008502   
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melatonin receptor activity
http://purl.obolibrary.org/obo/GO_0008502

Combining with melatonin, N-acetyl-5-methoxytryptamine, to initiate a change in cell activity. Melatonin is a neuroendocrine substance that stimulates the aggregation of melanosomes in melanophores, thus lightening the skin.

Also appears inhcaogexoccoretouberon + 4