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Phylogenetic tree depicting the relationships among the 68 prototype strains of HEV serotypes listed in Table 1 and based on the alignment by Clustal W of the central part (nucleotides 1178 to 1545, with reference to PV-1) of the VP2 coding region. The tree was constructed using MEGA 3.1 software according to the neighbor-joining method. Only bootstrap values over 70 are shown.
