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- W2022103413 abstract "The goal of this study was to investigate whether all the cell types present in the chick embryo retina undergo developmental neuronal death. Apoptosis was investigated in retinal sections at different developmental stages, processed either with propidium iodide, which stains pyknotic nuclei intensely, or with terminal transferase-mediated deoxyuridine triphosphate (d-UTP)-biotin nick-end labeling (TUNEL). Internucleosomal DNA fragmentation was investigated in tissue extracts by agarose gel electrophoresis. TUNEL-positive (T+) cells and pyknotic nuclei were first detectable in the ganglion cell layer (GCL) around embryonic day (ED) 8 and peaked at ED 10. In the inner nuclear layer (INL), T+ and pyknotic cells first appeared on ED 8, reached maximum frequency on ED 11, and were largely absent after ED 14. DNA ladders were observed at all the stages, when T+ and pyknotic cells were abundant, but not on ED 4, when only scattered dead cells were observed histologically. Dying cells were virtually never detected in the outer nuclear layer (ONL) from ED 4 to postnatal day 2. After unilateral midbrain ablation on ED 5, there was a striking increase in the number of pyknotic and T+ cells in both the GCL and in the INL of the contralateral eye but not in the ONL. The absence of apoptotic cell death in the ONL during normal development and after tectal ablation shows that developmental death is not universal among the various cell populations present in the chick embryo retina and raises questions regarding mechanisms controlling both photoreceptor survival and the matching of pre- and postsynaptic elements in the outer plexiform layer of this species." @default.
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- W2022103413 date "1998-06-22" @default.
- W2022103413 modified "2023-10-06" @default.
- W2022103413 title "Developmental neuronal death is not a universal phenomenon among cell types in the chick embryo retina" @default.
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- W2022103413 doi "https://doi.org/10.1002/(sici)1096-9861(19980622)396:1<12::aid-cne2>3.0.co;2-l" @default.
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