Strikingly, only members of the Retroviridae were observed in three nonavian reptile species used as a comparison. Due to a lack of comparable genome-scale sequence data, far less is known about endogenous viral elements in avian species, even though their small genomes may enable important insights into the patterns and processes of endogenous viral element evolution.ResultsThrough a systematic screening of the genomes of 48 species sampled across the avian phylogeny we reveal that birds harbor a limited number of endogenous viral elements compared to mammals, with only five viral families observed: Retroviridae, Hepadnaviridae, Bornaviridae, Circoviridae, and Parvoviridae. more BackgroundMammalian genomes commonly harbor endogenous viral elements. ![]() BackgroundMammalian genomes commonly harbor endogenous viral elements.
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