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Journal of Neuroscience, Vol 5, 1934-1939, Copyright © 1985 by Society for Neuroscience
Glutamic acid decarboxylase immunoreactivity in layer IV of barrel cortex of rat and mouse
CS Lin, SM Lu and DE Schmechel
The morphology and distribution of neurons and terminals that are
immunoreactive to glutamic acid decarboxylase (GAD) were investigated in
barrel cortex of the rat and mouse. The morphology of the GAD-
immunoreactive neurons located in layer IV of the barrel field resembles
that of the large, smooth stellate neurons described previously in Golgi
studies. Most of the somas of GAD-positive neurons are located along the
sides of the barrels. They constitute about 13 to 15% of the total neuronal
population in layer IV. The spatial distribution of GAD-positive terminals
in layer IV is similar to the distribution of GAD-positive somas. Very few
GAD-positive neurons and terminals are found in the septal regions. This
unique distribution of GAD immunoreactivity in the barrel cortex may serve
as a model to study cortical inhibitory mechanisms.
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