Fig. 6

Retroviral envelopes encountered in hg19. Env subgroup consensuses (see Additional file 4: List S4) and reference envelope proteins were aligned by Muscle. A Maximum Likelihood tree was then produced. Branch names of the subgroup consensuses contain, in this order, taxorder nr, “con”, subgroup name, subgroup average percent identity to consensus for the envputein (if the subgroup had only one member, a 0 is shown), a 13 amino acids subdomain from the ISD (if identified), subgroup average percent identity to consensus for 23 ISD amino acids (Additional file 1: Table S1) and bootstrap value of the relation (percent of 100 bootstraps)