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.
Representative examples of US-23 isolates that grouped together by geographic origin (A and B), and US-23 isolates from distant geographic origins that grouped together (C and D). All four groups shown here are exactly as they appear in the US-23 neighbor-joining tree containing all 166 US-23 isolates (S3 Fig).
