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Hepatitis B virus DNA in Dane particles: evidence for the presence of replicative intermediates.

Half the Dane particle concentrates isolated from 84 serum samples of patients infected with hepatitis B virus (HBV) contained more than one HBV DNA species. At most, six HBV DNA molecules migrated on hybridization blots. The fastest migrating species was single minus-strand DNA, and the five slower species all were double-stranded relaxed circular DNA. One of the latter forms corresponded to the full-length HBV genome; the four others contained shorter plus strands of different lengths and might represent replicative intermediates. These results indicate that the replicative forms of HBV previously found in infected liver cells might be coated and exported as early as the step of single minus-strand synthesis.