Figure 9

Env phylogenetic tree generated using the Neighbor-Joining method performed in the PAUP program (v4.0b10) on a 519-bp fragment of the Env gene using 75 HTLV-1 available sequences available in Genbank. The new Noir Marron data are coded in red. The Noir Marron data already published are coded "NM". The Mel5 and VAN136 strains were used as out-group. The HTLV-1 strains were aligned with the DAMBE program (version 4.2.13). The final alignment was submitted to the Modeltest program (version 3.6) to select, according to the Akaike Information Criterion (AIC), the best model to apply to phylogenetic analyses. The selected model was the GTR. Bootstrap support (1,000 replicates) is noted on the branch of the tree.