Dopamine is a major neurotransmitter in the retina involved in signal transmission in the visual system.

Glycine is a major post-synaptic inhibitory neurotransmitter in mammalian spinal cord and brain stem.

GABA is a major inhibitory neurotransmitter in the central nervous system.

Acetylcholine is one of a number of major neurotransmitters, chemicals that transmit messages among brain cells.

Serotonin is a major neurotransmitter that contributes to a feeling of well-being.

GABA is the major inhibitory neurotransmitter; it slows down the activity of the others.

Acetylcholine is a major neurotransmitter in the central and peripheral nervous system.

Also, their findings concluded GABA is a major neurotransmitter in the area postrema, not glutamate.

Clinical findings have provided evidence that adenosine, a major inhibitory neurotransmitter in the central nervous system, plays a role in the development of tardive dykinesias.

Glycine is a major post-synaptic inhibitory neurotransmitter with a specific receptor site.