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Comprehensive analysis of M genes from current PEDV with reference strains. (a) Phylogenetic analysis based on M aa; (b) point mutations analysis of M aa; (c) hydrophobic analysis of S aa. Phylogenetic tree is constructed by the neighbor-joining method with the MEGA 4.0 program. The percentage bootstrap support (per 1000 replicates) is indicated by the values at each node. Cross asterisk indicated present isolates; triangle indicated attenuated strains; box indicated point mutations.
