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Abstract
Light and electron microscopic autoradiography have been used to identify the cells accumulating 3H-GABA into the chicken retina and both the "red spot" and peripheral areas of the pigeon retina. The results are essentially the same in both species. 3H-GABA is incorporated into horizontal, amacrine, and ganglion cells and there is also a localized uptake into a synaptic stratum in the proximal regions of the inner plexiform layer. The findings are discussed in terms of retinal organization.