Skip to main content
. 2015 Sep 29;10(11):e1096469. doi: 10.1080/15592324.2015.1096469

Figure 1.

Figure 1.

Proposed biosynthetic pathways for melatonin and serotonin in plants and animals. AADC: aromatic L-amino acid decarboxylase; ASMT: acetylserotonin methyltransferase; COMT: caffeic acid-O-methyltransferase; HIOMT: hydroxyindole-O-methyltransferase; T-5-H: Tryptamine-5-hydroxylase; TDC: tryptophan decarboxylase; TPH: tryptophan hydroxylase; SNAT: serotonin N-acetyltransferase. Green arrows indicate an established biosynthetic pathway in plants, red arrows an established biosynthetic pathway in animals, black a step shared by both the animal and plant established pathways and blue arrows indicate a newly proposed alternate step in the biosynthetic pathway.