Nuclear aspects of neuroblast differentiation in the chick embryo
Por:
Vazquez-Nin G.H., Ortega-Rangel J.A., Echeverria O.M.
Publicada:
1 ene 1980
Resumen:
Nuclei of matrix cells, neuroblasts and maturing neurons of the spinal cord of the chick embryo were studied by means of a method contrasting RNA in electron microscopy. Perichromatin granules are almost absent from matrix cells, they occur in small numbers in neuroblasts of 4-day embryos and they become numerous in maturing neurons of older embryos. In 9- and 13-day embryos perichromatin granules are frequently grouped in the nuclear sap and surrounding the nucleolus. The analysis of the variance of their diameters inside the groups and between the groups demonstrates very significant differences in the size of the granules of various groups. This result is in accordance with the hypothesis that perichromatin granules store RNA from specific segments of transcriptionally active chromatin.
Filiaciones:
Vazquez-Nin G.H.:
Lab. Microsc. Electron., Fac. Med., UNAM, Mexico D.F., Mexico
Ortega-Rangel J.A.:
Lab. Microsc. Electron., Fac. Med., UNAM, Mexico D.F., Mexico
Echeverria O.M.:
Lab. Microsc. Electron., Fac. Med., UNAM, Mexico D.F., Mexico
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