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Phylogenetic trees for genome segments of the three Singapore isolates. Using methods described in Fig. 1, phylogenetic analysis was performed based on recombination breakpoints shown in Fig. 2. The genome segments correspond to the following HXB2 positions: (I) nts 796 to 4300; (II) nts 4301 to 5200; (III) nts 5201 to 5800; (IV) nts 5801 to 7600; and (V) nts 7601 to 8701. The bootstrap value at the node of the newly sequenced strains is shown.
