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(a) Phylogenetic analysis of the complete genome sequences of the strain SHXB, other TGEV reference strains, and strain PRCV-ISU-1. (b) Phylogenetic analysis of the S protein of strain SHXB, other TGEV reference strains, and strain PRCV-ISU-1. Both of these phylogenetic trees were constructed using the neighbor-joining method with the MegAlign program
