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Phylogenetic tree of the NA gene of H5N1 viruses from Bangladesh, generated by neighbor-joining method in MEGA 5. Numbers at the branches indicate bootstrap values; only values >70 are shown. ▴ indicates Bangladesh isolates clade 2.2.2; ▪ indicates Bangladesh isolates from the A/Hubei/1/10-like lineage of clade 2.3.2.1; • indicates Bangladesh isolates from the A/Hong Kong/6841/10-like lineage of clade 2.3.2.1.
