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.
Single-molecule assay for analysis of ScTopA relaxation activity. (A) The scheme of the experiment. (B) Extension versus supercoiling curve for 2-kb dsDNA extended by a force F = 0.3 pN. (C) Time-trace of ScTopA activity acting on 2-kb dsDNA for positive (+SC) and negative (−SC) supercoiling.
