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.
Extension versus supercoiling at 8 pN for a single DNA-RecA-ATPγS fiber in the absence of RecA and ATPγS in solution. The molecule is twisted from ∼−600 turns to −150 turns (□), then untwisted back to −1000 turns (not shown), and retwisted from there up to 150 turns (+).
