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.
Guanine quadruplex (GQ) structure. (A) The G-tetrad, a planar arrangement of four Hoogsteen-hydrogen bonded guanine residues that forms the layers of a GQ. (B) Propeller-type GQ topology with parallel G-tracts. (C) Basket-type GQ with antiparallel G-tracts.
