FIG. 3.
Phylogenetic tree generated by the NJ method with a 522-bp fragment encompassing most of the gp21 and the carboxyl terminus of gp46 for the four new sequences from mandrill STLV-1 strains Mnd9, Mnd13, Mnd15, and Mnd18, 39 other STLV-1 sequences, and 93 HTLV-1 sequences. An HTLV-2 sequence (MO) was used as an outgroup to root the tree. The numbers at some nodes or branches (bootstrap values) indicate frequencies of occurrence for 500 trees. The bar represents 0.01 nucleotide substitution per site or 1% divergence.