Evolution of viral proteins originated de novo by overprinting.

Abstract excerpt

New protein-coding genes can originate either through modification of existing genes or de novo. Recently, the importance of de novo origination has been recognized in eukaryotes, although eukaryotic genes originated de novo are relatively rare and difficult to identify. In contrast, viruses contain many de novo genes, namely those in which an existing gene has been "overprinted" by a new open reading frame, a...

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