serotonin neurotransmitter molecule. atoms are represented as spheres with conventional color coding: hydrogen (white), carbon (

5hydrotryptamine antidepressant antiemetic atomic atoms blood bond carbon central chemical chemistry clotting composition compound enterochromaffin formula gastrointestinal happiness hemostasis hydrogen model molecular molecule monoamine nervous neurotransmitter nitrogen oxygen platelet platelets serotonin serotonine structure system tract tryptophan wellbeing