Abstract
The smallest size class of mRNA (12S) synthesized in vitro by the virion-associated RNA polymerase of vesicular stomatitis virus contains two mRNA species of similar molecular weight that code for the viral M and NS proteins. The resolution of these mRNA species was achieved by converting them to duplexes by annealing with the genome RNA, followed by RNase T2 treatment and separation in a polyacrylamide gel. Using this separation technique, the mRNA's were identified by comparing the relative resistance of their syntheses to UV irradiation of the virus. The molecular weights of these two mRNA species calculated as duplex RNAs were smaller than expected. The possible reasons for this discrepancy are discussed.
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