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- W2057312797 abstract "Morphogenesis and time and place of cell origin of the subcommissural organ and adjacent ependyma in the mouse brain was investigated by light microscopy and autoradiography. Pregnant mice were injected systematically at different stages of gestation and their offspring killed after various periods. Cells of the subcommissural organ arise (undergo final replication of nuclear DNA) from embryonic days 11 to 15 at the diencephalomesencephalic junction in close association with the primordial fibers of the posterior commissure. The ependymal cells of the caudal part of the third ventricle first arise at approximately the same embryonic stage as the subcommissural cells and continue to proliferate through embryonic day 18. The subcommissural organ is suitable for semiquantitative analysis because its cells are of one type, their number is small, they arise over a short time span and once formed, they persist indefinitely. Some cells exposed to thymidine-H3 in utero at the time of final DNA replication were strongly labeled at adulthood, as expected, but others were weakly labeled. Calculations suggested that significant numbers of these weakly labeled cells should be assigned to the nondividing class i.e., had their birthdays on the day of thymidine-H3 injection. Errors are introduced if the usual practice is followed of assigning birthdays on the basis of the heavily labeled population exclusively." @default.
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- W2057312797 date "1968-03-01" @default.
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- W2057312797 title "Subcommissural organ and adjacent ependyma: Autoradiographic study of their origin in the mouse brain" @default.
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- W2057312797 doi "https://doi.org/10.1002/aja.1001220210" @default.
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