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Replication of the 3.2-kb hepatitis B virus (HBV) genome is driven by the covalently closed circular (ccc) DNA in the nucleus, from which four classes of co-terminal RNAs are transcribed. Genome replication requires just the 3.5-kb pregenomic RNA, which is terminally redundant. Cloning the full-length HBV genome into a vector disrupts its continuity, thus preventing genome replication at the step...
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