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Phylogenetic analysis of eight ORF26 SNP types. The sequences of eight types of ORF26 SNPs were aligned and analyzed by CLUSTAL W to produce a phylogenetic tree. The eight SNP types were divided into three groups: group I, types 1 and 2; group II, types 4, 5, and 6; and group III, types 3, 7, and 8.
