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.
Alignment of the large T proteins of SV40-Ri257 and SV40-776. Red boxes indicate regions of amino acid polymorphisms used in strain designation for classical type SV40. The red arrowhead indicates a deletion-insertion site also used in strain designation.
