LAGUNA DESIGN / SCIENCE PHOTO LIBRARY LAGUNA DESIGN / SCIENCE PHOTO LIBRARY
Serotonin molecule. Computer model showing the structure of the neurotransmitter (nerve signalling chemical) serotonin (5-hydroxytryptamine). Atoms are colour-coded (carbon: dark grey, hydrogen: light grey, 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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