Summary
Five monoclonal antibodies aginst GABA were tested on glutaraldehyde fixed sections of optic lobes of three insect species, blowflies, houseflies and worker bees. The specificity of these antibodies was analyzed in several tests and compared with commercially available anti-GABA antiserum.
A very large number of GABA-like immunoreactive neurons inncrvate all the neuropil regions of these optic lobes. Immunoreactive processes are found in different layers of the neuropils. The immunoreactive neurons are amacrines and columnar or noncolumnar neurons connecting the optic lobe neuropils. In addition some large immunoreactive neurons connect the optic lobes with centers of the brain.
Some neuron types could be matched with neurons previously identified with other methods. The connections of a few of these neuron types are partly known from electron microscopy or electrophysiology and a possible role of GABA in certain neural circuits can be discussed.
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Meyer, E.P., Matute, C., Streit, P. et al. Insect optic lobe neurons identifiable with monoclonal antibodies to GABA. Histochemistry 84, 207–216 (1986). https://doi.org/10.1007/BF00495784
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DOI: https://doi.org/10.1007/BF00495784