|Neuronal nitric oxide synthase (nNOS)-immunoreactive (IR) cells are present in the retina of almost all species. Here we report about an unusual localization of nNOS-IR cells in the porcine retina. The neurons showed co-localization with calretinin. Most of their processes ran parallel to the ora serrata but some were disposed at right angles to the line of the ora serrata, directed either to the epithelial layer of the pars plana or towards the retina. The function of these uniquely located neurons in the porcine retina remains to be determined. The presence of neuronal nitric oxide synthase (nNOS)- immunoreactive (IR)/nicotinamide adenine dinucleotide phosphatediaphorase (NADPH-d) positive cells (mainly amacrine cells) is well known in the retina of numerous species
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