FIG. 1.

Phylogenetic trees of the V1-V3 viral envelope sequences from plasma virus populations isolated from patient T28 (A) and T5 (B). Trees were drawn using Clustal X after gap stripping, using 705 nucleotides for patient T28 and 687 nucleotides for patient T5. Clones from patient T5 sharing identical amino acid sequences are grouped within dashed ellipses. Filled circles represent clones selected for further infectivity and neutralization analyses. Numbers at each branch point indicate the bootstrap values derived from 100 bootstrap resamplings. Bootstrap values greater than 90 are indicated.