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Consensus phylogenetic tree resulting from the analysis of the nucleotide sequences of the S1 gene of IBV isolate ck/CH/LHLJ/140906 (black star), other 793/B reference strains, LX4- and Massachusetts-type viruses (accession numbers in parentheses). The trees were computed using the neighbor-joining method with 1000 bootstrap replicates using the MEGA4 program.
