Figure 1.

The neighbor-joining tree obtained from 70 HIV/SIV nucleotide sequences (distance matrix calculated by using the N-localdecoding method for N = 15). The sequences names are written as follows: their GenBank accession numbers, followed by their nomenclature names [9–11, 14, 15]. These sequences can be retrieved from the Los Alamos HIV sequence database [24]. Bootstrap values (≥ 90%) are indicated.