Figure 4.

Unrooted maximum likelihood tree of the haemagglutinin gene sequences of S-OIV and the most closely related sequences in Genbank. The ten closest are marked with red arrows. Details of the sequence selection and tree inference methods used are in Additional File 1.

Gibbs et al. Virology Journal 2009 6:207   doi:10.1186/1743-422X-6-207
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