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GABA and GAD immunoreactiviy of photoreceptor terminals in primate retina

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Abstract

Within the vertebrate retina, two types of photoreceptor cells—the rods and cones—transduce visual signals and convey this information through synapses with bipolar and horizontal cells. Although the neurotransmitter at these first-order synapses has not been identified, electrophysiological studies1,2,3 suggest that it might be excitatory. In the present study, however, we have found photoreceptor terminals in the rhesus monkey retina which are immunoreactive with antibodies to either γ-aminobutyric acid (GABA) or L-glutamic acid decarboxylase (GAD, an enzyme involved in the synthesis of GABA). In the perifoveal region of the retina, approximately 25% of presynaptic profiles having ultrastructural characteristics of either rod or cone terminals are immunoreactive with one or the other antibody. This evidence for a putatively inhibitory neurotransmitter in photoreceptor terminals challenges present understanding of retinal synaptic function.

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Authors and Affiliations

  1. Section of Neuroanatomy, Yale University School of Medicine, 333 Cedar Street, New Haven, Connecticut, 06519, USA

    Yozo Nishimura, Michael L. Schwartz & Pasko Rakic

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  1. Yozo Nishimura
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  2. Michael L. Schwartz
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  3. Pasko Rakic
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Nishimura, Y., Schwartz, M. & Rakic, P. GABA and GAD immunoreactiviy of photoreceptor terminals in primate retina. Nature 320, 753–756 (1986). https://doi.org/10.1038/320753a0

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  • DOI: https://doi.org/10.1038/320753a0

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