An official website of the United States government
Here's how you know
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.
Changes in the helical parameters twist (upper two curves) and roll (lower two curves) between the base pairs flanking the opening base as a function of Δθ. Solid lines correspond to thymine opening and dotted lines to cytosine opening.