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.
Distributions of amino acid sequence differences in epitopes (A) and overall gene sequences (B). All differences in sequences are shown on the left, while only nonconservative differences identified based on physicochemical properties are shown on the right.
