FIG. 1.

Phylogenetic reconstruction of human and nonhuman primate CCR5 homologue sequences by using the neighbor-joining algorithm. We used one representative CCR5 sequence per species (Table 1). The numbers are bootstrap values (percentages); each value refers to the branch to its right or left. Branches with no bootstrap values had either a bootstrap value not greater than 50% (rare) or a branch length near or equal to zero (common). Apes are highlighted in blue, Old World monkeys are highlighted in magenta, New World monkeys are highlighted in green, and prosimians are highlighted in red.