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Phylogenetic tree of the S1 gene of 207 reference and 34 Polish IBV strains (bold underlined letters). The tree was constructed using MEGA 7 using the maximum likelihood method based on the GTR + G + I model and 1000 bootstrap replicates (bootstrap values shown on the tree). To make the tree clearer visually, branches with IBV lineages only distantly correlated with studied Polish strains are collapsed.
