The continued synthesis of both 5S and 4S RNA in metaphase-arrested HeLa cells is demonstrated; 5S RNA is apparently synthesized at approximately 74 percent of the interphase rate, while 4S RNA is synthesized at approximately one-third the rate. The ratio of uridine incorporation to RNA methylation is used to correct for the alteration in the specific activity of the pyrimidine pool during metaphase arrest.
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Zylber et al. (1971) studied this question.
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