FIG. 6.

Phylogenetic relationships among eight HIV-1 group O Spanish samples. (A) Consensus 576-bp fragments encoding amino acids 28 to 219 of the RT (Fig. 3) were utilized to construct a neighbor-joining tree as described in Materials and Methods. Enclosed are the longitudinal samples corresponding to the related viruses (ESP1 and ESP2). (B) A phylogenetic tree was constructed from a 267-bp fragment (codons 28 to 116) in the RT-coding region of 80 individual clones from these eight samples. Each set of quasispecies is encircled. Bootstrap resampling percentage values (1,000 sets) are indicated.