Figure 1.

Evolutionary relationships of HIV-1 env clones. Evolutionary history was inferred using the Neighbor-Joining method. (A) V1-V5 nucleotide sequences of cloned env and subtype reference sequences. Filled triangle = infant, empty circle = maternal sequence. (B) Full length gp160 nucleotide sequences. M = maternal, P = infant. The percentage of replicate trees in which the associated sequences clustered together >70% of the time in the bootstrap test (1000 replicates) are shown to the left of branches in (B). The evolutionary distances were computed using the Kimura 2-parameter method. All positions containing gaps and missing data were eliminated from the dataset. Horizontal scale bars represent (A) 5%, or (B) 1% genetic distance.