MICHAEL W. DAVIDSON / SCIENCE PHOTO LIBRARY MICHAEL W. DAVIDSON / SCIENCE PHOTO LIBRARY
Serotonin crystals. Polarised light micrograph (LM) of the neurotransmitter serotonin (5- hydroxytryptamine). Serotonin is released by blood platelets during clot formation, where it causes the constriction of blood vessels. It is an important neurotransmitter in the brain, and a lack of it has been shown to cause depression. It is this property which has led to the development of the SSRI (selective serotonin reuptake inhibitor) antidepressants, such as Prozac (fluoxetine). The hormone melatonin is made from serotonin in the brain's pineal gland.
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