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Roossinck MJ, Sabanadzovic S, Okada R, Valverde RA (2011) The remarkable evolutionary history of endornaviruses. Journal of General Virology 92(Pt 11): 2674-2678.

DOI: 10.1099/vir.0.034702-0
EID: 2-s2.0-80053955800
PMID: 21775577

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ABSTRACT
The family Endornaviridae contains several members from diverse hosts, including plants, fungi and oomycetes. They are found as large dsRNA elements with a nick in the coding strand. All members encode a conserved RNA-dependent RNA polymerase, but no other domain that is conserved among all members. Based on the conserved domain database comparison the various domains have different origins, indicating a highly modular evolutionary history. In some cases, domains with similar putative functions are found that are derived from different protein families, indicating convergent evolution for a required function.