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.
One-degree step change in portal register (inner 12-fold circle) with respect to capsid vertex (outer 5-fold circle), beginning with ‘0°’. Portal register ‘6°’ is superposable on register ‘0°’ by 144° rotation of the whole capsid (i.e. rotating both inner and outer circles together).
