altered amine and amino acid-derived hormone signaling pathway +
altered signaling pathway pertinent to the brain and nervous system +
cannabinoid signaling pathway +
catecholamine signaling pathway +
dopamine signaling pathway +
epinephrine signaling pathway +
gasotransmitter mediated signaling pathway +
histamine signaling pathway +
melatonin signaling pathway
Melatonin, in human and other organisms derived from tryptophan, is a monoamine with antioxidant properties and involved in the synchronization of the circadian rhythms. Melatonin signals through three receptors types of which two are present in humans and other mammals. They are G protein coupled receptors (GPCR).