Why are hepadnaviruses DNA and not RNA viruses?

  title={Why are hepadnaviruses DNA and not RNA viruses?},
  author={Christoph Seeger and Jun Hu},
  journal={Trends in microbiology},
  volume={5 11},
Virion assembly in hepadnaviruses is a two-step process leading to (1) the packaging of viral pregenomic RNA and reverse transcriptase into nucleocapsids and (2) the assembly of nucleocapsids with envelope components, which results in the formation of mature virus particles. Characteristically, both steps are intimately coupled to viral DNA synthesis. While assembly of nucleocapsids is coupled to the protein priming of reverse transcription, virion formation is linked to genome maturation. 

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