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.
Docked poses of NTX (orange carbon atoms) inside three opioid receptor crystal structures: A) MOR B) KOR and C) DOR. Amino acid residue atoms: carbon (cyan), oxygen (red), nitrogen (blue), sulfur (yellow).