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.
Structure of an HJ. (a) Diagram outlining the principle of immobile-HJ folding used in single-pair FRET studies. (b) Schematic of the HJ central sequence with a 20-bp D-A distance, including Cy3 (donor) and Cy5 (acceptor) dyes marked by arrows. Variable parts of the HJ design are shown in boldface letters (see Materials and Methods for details).
