Phylogenetic tree generated from the VP4 gene, showing relationships between HEV71 isolated in different years. The bar denotes relative phylogenetic distance and indicates proportion of nucleotide substitutions per site. The sequence of the VP4 gene region (position 747–953, relative to HEV71 strain 7423-MS-87) is used for the generation of this tree.
Podin et al. BMC Public Health 2006 6:180 doi:10.1186/1471-2458-6-180