ANTONIO ROMERO / SCIENCE PHOTO LIBRARY ANTONIO ROMERO / SCIENCE PHOTO LIBRARY
Serotonin crystals. Polarized light micrograph of crystals of the neurotransmitter serotonin. This monoamine chemical is primarily found in the digestive tract, where it helps regulate intestinal movements. It is also found in the central nervous system (CNS), aiding feelings of well-being and happiness. Field of view size: 0.74 x 1.11 millimetres.
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