different locations.

There are 31 known families of HERVs, constituting approximately about 8% of the human genome of which HERV-W DNA encoding sequences specifically account for about 1% of the human genome. For comparison, this represents about the same amount of DNA allocated to protein coding genes.

Most HERVs in the genome today are not able to replicate, because of genetic changes such as frame shifts, premature stop codons,

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