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.
(A) Neighbor-joining tree of non-overlapping portions of the S gene based on MCL distance at 3310 aligned nucleotide sites. (B) Neighbor-joining tree of the 3′ end of the b portion of the 1 ab gene based on MCL distance at 123 aligned nucleotide sites. Numbers on the branches represent the percentage of 1000 bootstrap samples supporting the branch; only values ≥50% are shown
