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.
Proposed equilibrating forms of DNA produced under negative supercoiling induced by transcription: (a) duplex, (b) locally unwound, (c) single stranded, (d) G-quadruplex/i-motif structure. Figure is modified, with permission, from [14], © (2009) American Chemical Society
