Melatonin receptors
melatonin receptors
A melatonin receptor is a G protein-coupled receptor (GPCR) which binds melatonin.  Three types of melatonin receptor have been cloned. The MT 1 (or Mel 1A or MTNR1A) and MT 2 (or Mel 1B or MTNR1B) receptor subtypes are present in humans and other mammals, while an additional melatonin receptor subtype MT 3 (or Mel 1C or MTNR1C) has been identified in amphibia and birds.