Figure 3
Phylogenetic tree of lentiviruses based on the pol gene. Blue stars correspond to the presence of PQSs in the corresponding group of lentiviruses. The symbol * indicates our reference virus HIV-1 group M. Human and animal silhouettes were obtained at http://www.freepik.com and http://www.flaticon.com/ (http://www.freepik.com/free-vector/business-team-outlines-pack_831669.htm#term=human; http://www.flaticon.com/free-icon/monkey_47138; http://www.freepik.com/free-vector/cat-silhouettes-set_718091.htm#term=cat; http://www.flaticon.com/free-icon/horse-standing-black-shape_35907; http://www.freepik.com/free-vector/cows-and-bull-silhouettes_788343.htm; http://www.freepik.com/free-vector/pack-of-farm-animal-silhouettes_1058750.htm#term=sheep&page=1&position=29).
