Abstract
Electrophysiological and biochemical investigations have shown that γ-aminobutyric acid (GABA) is the main inhibitory neurotransmitter in the vertebrate central nervous system. However, the present study shows that some motoneurons located in the spinal cord of young chickens and adult monkeys display a GABA-like immunoreactivity. The expression of GABA immunoreactivity in vertebrate motoneurons suggests that this inhibitory amino acid is colocalized with acetylcholine and could play a role in the neuromuscular transmission.
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