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Abstract
Radioactively labeled RNAs were synthesized from cellulose-bound cDNA templates using Escherichia coli RNA polymerase. Hybridization of this RNA to excess unlabeled cDNA approached 100%, indicating the complementarity of product and template. The average length of the RNA product, as determined by formamide gels, was approximately 40% of the template length. Hybridization of unlabeled globin RNA produced by this technique to labeled globin cDNA indicated the population of RNA sequences represented at least 80% of the template sequences. Approximately 30% of the RNA product by mass contains poly(A) tails as determined by binding to oligo(dT)-cellulose. The template can be reused for several cycles of synthesis with little loss of synthetic capability and therefore, can amplify the amount of mRNA initially used to produce the template.
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