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.
Helical wheel diagram showing one heptad of a parallel, four-stranded helical coiled coil (or four-helical bundle assuming a sequence repeat of 7.0 residues) viewed down the bundle axis. The dashed circles demarcate three regions that are predicted to show different perturbational effects (see text).
