MIRIAM MASLO / SCIENCE PHOTO LIBRARY MIRIAM MASLO / SCIENCE PHOTO LIBRARY
Serotonin molecule. Molecular model of the neurotransmitter (nerve signalling chemical) serotonin (5-hydroxytryptamine). Atoms are represented as spheres and are colour-coded: carbon (black), hydrogen (white), nitrogen (blue) and oxygen (red). Serotonin is an important brain signalling molecule and a lack of it has been shown to cause depression and other mood disorders.
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