NCIt definition : Members of the G protein-coupled superfamily of receptors. Two pharmacologically distinct
high affinity melatonin receptors have been identified, Mel1 and Mel2, and Mel1 class
receptors Mel1A, Mel1B, and Mel1C have been cloned. Transduce signals via at least
two pathways, one inhibiting adenylyl cyclase and the other regulating phospholipide
metabolism and calcium concentration.;