identified by similarity to known viruses. In 2021, it has been demonstrated that the k-mer composition of endogenous RNA virus resemble that of their exogenous counterparts. As a result, it is now possible to identify novel groups of endogenous RNA viruses whose exogenous relatives have become extinct.

Use in paleovirology

EVEs are a rare source of retrospective information about ancient viruses. Many are derived from germline integration events that occurred millions of years ago, and can be

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