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.
General structure and topologies of G-quadruplexes (G4). (A) Representation of a G-quartet stabilized by Hoogsteen hydrogen bonds (left). Schematic representation of a G-quadruplex additionally stabilized by π-π interactions and monovalent cations (right). (B) Schematic illustration of different intra- and intermolecular G4 topologies with different guanosine conformations (syn and anti).
