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.
The specific interaction of the oxygen with the pyrrole ring, and the H-bond between the carboxyl oxygen and the α -NH amide of Trp, as shown in the figure, is speculative.
