MANFRED KAGE / SCIENCE PHOTO LIBRARY MANFRED KAGE / SCIENCE PHOTO LIBRARY
Gamma-aminobutyric acid. Polarised light micrograph (PLM) of crystals of the neuro- transmitter gamma-aminobutyric acid (GABA). A neurotransmitter is a chemical messenger which carries impulses from one nerve cell to the next. GABA is one of the most important of the neurotransmitters found in the central nervous system. High concentrations of GABA are found in a posterior section of the brain called the hypothalamus. This is the section of the brain which controls instinctive functions such as sleep cycles and body temperature. It is thought that GABA plays a major role in these functions. Magnification: x63 at 6x7 cm size.
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