FIG. 2.

Phylogenetic tree analyses of the new SIV sequences SIVwrc, from a western red colobus (Piliocolobus badius), and SIVolc, from an olive colobus (Procolobus verus). A 650-bp (A) fragment and a 2,000-bp (B) fragment were amplified in pol, sequenced, and subjected to phylogenetic tree analysis by using the neighbor joining method. The positions of the SIV sequences that were derived from the present study (boxed in black) are shown in relation to HIV and SIV reference sequences representing the different known SIV sequences available in this region of the genome. Branch lengths are drawn to scale (the bar for panel B indicates 10% divergence). The numbers at the nodes indicate the percent bootstrap values supporting the cluster to the right (only values of >80% are shown).