Using an antibody to gamma-aminobutyric acid (GABA), we examined the optic nerves and optic tracts from macaque monkeys at the light and electron microscopic levels to determine if there is a possible inhibitory projection from the retina to the brain. All of the monkeys (n = 5) had GABA immunopositive axons that were evenly distributed in their optic nerves. These immunopositive axons were slightly larger than the axons around them and comprised an average of 2.6% of the axons in the nerves....Expand abstract
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GABA immunopositive axons in the optic nerve and optic tract of macaque monkeys.
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