Number of melatonin receptors

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How many melatonin receptors are there?

3

It is important to know that a melatonin receptor is a G protein-coupled receptor (GPCR) which binds melatonin.   There are 3 types of melatonin receptors: the MT1 (or Mel1A or MTNR1A) and MT2 (or Mel1B or MTNR1B) receptor subtypes are present in humans and other mammals, while an additional melatonin receptor subtype MT3 (or Mel1C or MTNR1C) has been identified in amphibia andbirds.  It is important to know that in mammals, melatonin receptors are found in the brain and some peripheral organs.

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