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K Tornqvist, B Ehinger; Peptide immunoreactive neurons in the human retina.. Invest. Ophthalmol. Vis. Sci. 1988;29(5):680-686.
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The distribution of peptide-immunoreactive neurons in the human retina was investigated. Neurons displaying immunoreactivity towards substance P, vasoactive intestinal polypeptide (VIP), somatostatin, neuropeptide Y (NPY) and peptide histidine-isoleucine (PHI) were found in amacrine cells with cell bodies situated in the innermost part of the inner nuclear layer and nerve fibers ramifying in the inner plexiform layer in a manner differing according to the peptide investigated. Two other cell types were found. In the middle of the inner plexiform layer cell bodies showing immunoreactivity towards substance P, VIP and PHI were found. In the ganglion cell layer there were cell bodies showing immunoreactivity towards substance P, somatostatin, VIP and NPY. Substance P immunoreactive, somatostatin and NPY immunoreactive fibers situated at the border between the inner nuclear and outer plexiform layers and traversing the inner nuclear layer were also found.
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