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Phylogenetic tree of HTLV-1 pol. The phylogenetic tree was constructed by the neighbor-joining method, based on the 1,827-bp RT-encoding regions of the pol gene. The tree was rooted by assuming the pol gene sequence of the HTLV-1c Mel5 isolate as the outgroup. The bootstrap test of phylogeny was used to determine tree branch reliability; values are indicated at each node.
