Using quantitative RNase protection assays, we have monitored the appearance of mRNAs generated during lytic infection of tightly synchronized murine cells by the autonomous parvovirus minute virus of mice. Our results demonstrate that transcripts from the P4 promoter can be detected prior to those from the P39 promoter, providing direct evidence for a temporal order of expression between the two parvovirus promoters.
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Clemens et al. (1988) studied this question.