has primary output serotonin(1+) biosynthetic process serotonin biosynthetic process serotonin formation serotonin synthesis serotonin anabolism Wikipedia:Serotonin serotonin biosynthesis GO:0042427 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. serotonin metabolic process indole-containing compound biosynthetic process phenol-containing compound biosynthetic process primary amino compound biosynthetic process