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Geographic distribution of HCV NS3 nucleotide sequences. The NS3 neighbor-joining phylogenetic tree is displayed in a circular format. The reliability of the tree topology was examined using 1,000 bootstrapping replicates, and bootstrap values of ≥50 are listed at appropriate nodes in the tree. The genetic distance scale bar indicates the number of nucleotide substitutions per site between sequences. Rest of world, 1 sequence each from Canada and Australia.
