Determination and analyses of the complete sequence of Fringilla coelebs papillomavirus and Psittacus erithacus timneh papillomavirus indicate that they represent a distinct and distant lineage of papillomaviruses. The lack of canonical E6-E7 open reading frames suggests that they serve adaptive functions during papillomavirus evolution.

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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC136527PMC
http://dx.doi.org/10.1128/jvi.76.19.10020-10023.2002DOI Listing

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