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. 2009 Nov 24;143(2):145–154. doi: 10.1016/j.vetmic.2009.11.022

Fig. 1.

Fig. 1

Phylogenetic tree constructed by neighbor-joining method (Mega 4.0). S1 nucleotide sequences of the 27 isolated and 29 published IBV strains were included for the phylogenetic analysis, where the 27 isolated IBV strains are marked with ante-black triangle.