The chemical reactions and pathways resulting in the formation of serotonin (5-hydroxytryptamine), a monoamine neurotransmitter occurring in the peripheral and central nervous systems, also having hormonal properties. [ GOC:jl https://www.worldcat.org/search?q=bn%3A0198506732 ]
Synonyms: serotonin formation serotonin anabolism serotonin biosynthesis serotonin synthesis