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Phylogenetic relationship of influenza A haemagglutinin subtypes. Evolutionary analysis involving 17 amino acid sequences representing HAs from each subtype was conducted in MEGA5 (Tamura et al, 2011). The evolutionary history was inferred using the Neighbor-Joining method, computing the evolutionary distances utilizing the Dayhoff matrix-based method. All positions with less than 100% site coverage were eliminated. Colours were added with FigTree software (http://tree.bio.ed.ac.uk/).
