Journal of General Virology

Fig. 2. Unrooted maximum-likelihood phylogenetic tree showing relationships between representative HBV strains derived from primates. All strains are labelled with their corresponding database accession number. Human-derived HBV strains belonging to different genotypes (A to G) are differentiated by colour. The outgroup used was genotype F strain X75658. WMHBV (accession AF046996) cannot be shown at this scale because of phylogenetic distance but branches off one-third of the way along the main genotype F branch and is more than twice as long as the latter. The tree and support values for internal branches are derived from the quartet puzzling program  TREEPUZZLE (www.treepuzzle.de).

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