A Vestigial X Open Reading Frame in Duck Hepatitis B VirusLin B. · Anderson D.A.
Macfarlane Burnet Centre for Medical Research, Fairfield, Melbourne, Australia
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Duck hepatitis B virus (DHBV) appears to lack a homologue of the X protein found in mammalian hepadnaviruses. By replacing stop codons in the corresponding region of the DHBV genome, a hypothetical protein which closely matches the hydrophilicity profile of X proteins can be predicted, despite limited sequence homology. We conclude that a full-length X protein was once a common feature of the hepadnaviruses, conserved in structure but not sequence.
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