Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Phylogenetic reconstruction based on the partial capsid gene sequences of norovirus GII.4 2012 variant strains, unassigned variant and reference strains by the neighbour-joining method. Bar, expected nucleotide substitutions per site. Only bootstrap values >70% are shown (1000 re-samplings) at each branch point. GenBank accession numbers of reference sequences are given in parentheses.
