serotonin chemical formula doodle icon,

5hydrotryptamine antidepressant antiemetic atomic atoms background biology blood bond carbon central chemical chemistry clotting composition compound drawing element enterochromaffin formula gastrointestinal graphic happiness hemostasis hormone hydrogen icon illustration isolated line molecular molecule monoamine nervous neurotransmitter nitrogen oxygen physiology platelet science scientific serotonin serotonine sign skeletal structural structure system tract white