Indolamines
（重定向自Indolamine）
![Tryptamine - otherwise known as indolamine.](/Images/godic/202501/20/Tryptamine_structure4744.png")
![The pathway for the synthesis of serotonin from tryptophan. Note that all compounds shown are indolamines.](/Images/godic/202501/20/Serotonin_biosynthesis.svg4744.png")
Indolamines are a family of neurotransmitters that share a common molecular structure (namely, indolamine). Indolamines are a classification of monoamine neurotransmitter, along with catecholamines and ethylamine. A common example of an indolamine is serotonin, a neurotransmitter involved in mood and sleep. Another example of an indolamine is melatonin, which regulates the sleep-wake cycle (circadian rhythm) in humans.