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.
Crystal structure of RNA G-quadruplex formed by the sequence (UGGGGU)4 in the presence of Sr2+ ions. The side view (A) and the view down the central ion channel (B) of the quadruplex. The schematic representation (C) shows that each Sr2+ ion is sandwiched by two G-quartets. (PDB entry 1J8G).
