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.
Domains within one cluster are superimposed on one another to show good structural alignment, with number of members in each cluster indicated. The prevalence of singlet clusters reflects the scarcity of structural data for many viral families.
