Density ratio of dopaminergic cells to other cells in the amacrine cell layer of the fish retina.

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Abstract
The retinas of mullet (Mugil cephalus) and carp (Cyprinus carpio) were processed for dopamine fluorescence, and were simultaneously counterstained with methyl green to obtain a differential nuclear fluorescence of other classes of cells. In tangential cryo-sections, the density was estimated for dopaminergic cells and other cells located at the innermost plane of the inner nuclear layer. In both the fish, the densities of the two classes of cells and the ratio of dopaminergic cells to other cells (mainly amacrine cells) were found to be higher in the peripheral region than in the rest of the retina.