Asynchronous Synthesis of RNA in Nucleoli of Root Meristem

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Science  21 Feb 1964:
Vol. 143, Issue 3608, pp. 808-810
DOI: 10.1126/science.143.3608.808


During pulse incubations of onion roots with RNA precursors, incorporation into meristematic nucleoli is asynchronous for some, but not for all, cells. After a 30-minute labeling period, the "zero-class" is as large as 25 percent, and the asynchrony is intracellular rather than cellular. This suggests an individual specificity of nucleolar function in a population of differentiating cells.