Editing Endosymbiont (section)

== Virus endosymbionts ==
{{main|Endogenous retrovirus}}

The [[human genome project]] found several thousand [[endogenous retrovirus]]es, [[endogenous viral element]]s in the [[genome]] that closely resemble and can be derived from [[retrovirus]]es, organized into 24 families.<ref>{{cite journal |author=Villarreal LP |title=Persisting Viruses Could Play Role in Driving Host Evolution |journal=ASM News |date=October 2001 |url=http://newsarchive.asm.org/oct01/feature1.asp |url-status=dead |archive-url=https://web.archive.org/web/20090508113235/http://newsarchive.asm.org/oct01/feature1.asp |archive-date=8 May 2009  }}</ref><ref>{{cite journal |vauthors=Belshaw R, Pereira V, Katzourakis A, Talbot G, Paces J, Burt A, Tristem M |title=Long-term reinfection of the human genome by endogenous retroviruses |journal=Proceedings of the National Academy of Sciences of the United States of America |volume=101 |issue=14 |pages=4894–4899 |date=April 2004 |pmid=15044706 |pmc=387345 |doi=10.1073/pnas.0307800101 |doi-access=free |bibcode=2004PNAS..101.4894B }}</ref>