GREG WILLIAMS / SCIENCE PHOTO LIBRARY GREG WILLIAMS / SCIENCE PHOTO LIBRARY
Serotonin is a neurotransmitter found primarily in gastrointestinal tract. Serotonin modulates a range of functions associated with eating, sleeping and digestion. Serotonin is popularly thought to contribute to well-being and happiness. Atoms are represented as spheres and are colour-coded: carbon (black), hydrogen (white), nitrogen (blue) and oxygen (red).
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