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• W2031408535 abstract "The ultrastructural features and synaptic contacts of two types of neurotensin-containing amacrine cells in turtle retina were examined by electron immunocytochemistry, and the retinal peptides were characterized using radioimmunoassay and high-pressure liquid chromatography. The two types of cell were distinguished on the basis of their sizes, dendritic arborizations, synaptic connections and cytoplasmic staining characteristics. Type A cells had lightly labeled cytoplasm and large vertically elongated cell bodies which gave rise to a single primary process which in turn branched and ramified as smooth tapering processes in stratum 3 of the inner plexiform layer. Type A cells received approximately equal synaptic input from amacrine and bipolar cells. Type A amacrines had much more overall synaptic input than synaptic output, and they made conventional synaptic contacts onto bipolar, amacrine, and ganglion cells. Type B cells had a much darker-staining cytoplasm and a smaller cell body which gave rise to numerous delicate beaded dendrites which arborized in strata 3, 4 and 5 of the inner plexiform layer. Type B cells received primarily amacrine and some bipolar cell input. Type B cells had equal amounts of synaptic input and output and they made conventional synaptic contacts onto amacrine, bipolar, and ganglion cells. Whereas there were numerous large vesicles (120 nm diameter) that stained for neurotensin in both types of cells, conventional synaptic vesicles (60 nm diameter) were not labeled. In several cases these large labeled vesicles appeared to fuse with the cell membrane in non-synaptic regions and release their contents into extracellular space, which suggested a non-synaptic release of the neurotensin from type A neurons. Immunochemical and chromatographic studies demonstrated that the neurotensin-related material in retina was indistinguishable from neurotensin found in brain. These results are consistent with a neuroactive role for the neurotensin present within the large vesicles. The differences in the synaptic contacts and dendritic arborizations of the two amacrine cell types suggest they play distinctive functions in visual processing." @default.
• W2031408535 created "2016-06-24" @default.
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• W2031408535 date "1987-05-01" @default.
• W2031408535 modified "2023-10-18" @default.
• W2031408535 title "Neurocircuitry of two types of neurotensin-containing amacrine cells in the turtle retina" @default.
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• W2031408535 doi "https://doi.org/10.1016/0306-4522(87)90146-1" @default.
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