Figure 2.

HIV relationship tree based on molecular function. All the virus IDs shown in the figure are Uniprot IDs. The length of each branch represents the distance between different viruses. HIV-1 and HIV-2 virus are almost completely separated, except HV1LA, which belongs to the HIV-1 group M subgroup B and is grouped with the HIV-2 virus, and HV2KR falls in the HIV-1 virus clade. SIVM1, which represents the simian immunodeficiency virus, shows closer relationship with HIV-2 virus. Meanwhile, HV192 has a little difference with other HIV-1 viruses in our figure. According to the graph, the distances among HIV-1 viruses are relatively farther than the distances between HIV-2 viruses.

Xu et al. BMC Systems Biology 2011 5(Suppl 3):S11   doi:10.1186/1752-0509-5-S3-S11