The B subgroup bovine papillomaviruses lack an identifiable E6 open reading frame

@article{Jackson1991TheBS,
  title={The B subgroup bovine papillomaviruses lack an identifiable E6 open reading frame},
  author={Maria Jackson and William D. Pennie and R E McCaffery and K. T. Smith and G. Joan Grindlay and Maria Saveria Campo},
  journal={Molecular Carcinogenesis},
  year={1991},
  volume={4}
}
Analysis of the corrected DNA sequence for the bovine papillomavirus type 4 (BPV4) genome revealed that there is no open reading frame (ORF) that might encode an E6 protein. The other two B subgroup bovine papillomaviruses, BPV3 and BPV6, were found to have the same arrangement of ORFs in this region as BPV4. Thus, we conclude that E6 functions are either not required by these viruses or are performed by another viral (or host) protein. Furthermore, the position that might be expected to be… 
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