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Phylogenetic tree for Chinese HRSV group A and group B nucleotide sequences, based on the second variable region of G protein (270 bp). Phylogenetic trees were constructed by the neighbor-joining method, using MEGA 4.0. Bootstrap values were determined for 1,000 replicates and are shown at the branch nodes. Reference strains for each genotype obtained from GenBank are marked. The genotype assignment is indicated to the right by brackets.
