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.
(a) Stereoview of crossed oligonucleotide duplexes, showing the interaction of two drugs with neighbouring phosphates of a symmetrical DNA chain. (b) Enlarged view of the interaction of two drugs with the neighbouring phosphates of a symmetrical DNA chain. A dyad axis runs through the centre of the figure.
