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.
Binding mode of letrozole (A), BCA (B) and XHN27 (C) in crystal structure of aromatase (PDB code: 4KQ8). Hydrogen bonds are shown as dashed green lines. Carbon atoms, oxygen atoms, nitrogen atoms and sulfur atoms are shown as grey, red, blue, and yellow, respectively.
