FIG 1 .
Maximum-likelihood phylogenetic reconstruction of the picornaviruses, based on peptide 3D amino acid sequences. The model used was LG (34) complete deletion, gamma distributed with invariant sites (G+I). The tree shows that phopivirus is most closely related to HAV. Relationships are consistent when repeated for other peptides. Scale indicates number of amino acid substitutions per site per year. Bootstrap values are shown at nodes.