at least one instance of viruses coming into existence. Within each realm, viruses are grouped together based on shared characteristics that are highly conserved over time. Three DNA virus realms are recognized: Duplodnaviria, Monodnaviria, and Varidnaviria.

Duplodnaviria

Duplodnaviria contains dsDNA viruses that encode a major capsid protein (MCP) that has the HK97 fold. Viruses in the realm also share a number of other characteristics involving

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