SUMMARY Polyadenylic acid tracts were shown to be present in the 42S 38S, 33S and 26S single-stranded RNA species found in cells infected with Semliki Forest virus, as well as in the 20S double-stranded (RF) RNA. The average polyadenylic acid content of the 42S and 26S RNAs purified on oligo(dT)-cellulose columns was 100 to 110 and 63 to 67 residues, respectively.
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Clegg et al. (1974) studied this question.
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